Deb: rename client library packages to reflect its contents

The new library name libmariadb3 matches the libmariadb.so.3 filename.
Packages that want to build against MariaDB Connector C have as
build-dependency libmariadb-dev and as run-time dependency libmariadb3.

Make the package provide libmariadbclient18 for backwards compatibility,
though compatibility is not always assured. There library did change
to a whole new generation after all, even though ABI compatibility has
been a design goal.

Also do the equivalent change for the -dev package. Packages that
explicitly want to use the MariaDB Connector C should mark it as
their build-depends.

Also provide an empty libmariadbclient18 metapackage to facilitate
upgrades from old MariaDB installs, just like there is an empty
libmysqlclient18 package. Create more of these in the future as needed.

debian/control

@@ -35,7 +35,7 @@ Homepage: http://mariadb.org/
 Vcs-Git: https://github.com/MariaDB/server.git
 Vcs-Browser: https://github.com/MariaDB/server/
 
-Package: libmariadbclient18
+Package: libmariadb3
 Architecture: any
 Section: libs
 Depends: mariadb-common, ${misc:Depends}, ${shlibs:Depends}
@@ -46,6 +46,8 @@ Conflicts: mariadb-galera-server-10.0 (<< 10.0.5),
            mariadb-server-5.2,
            mariadb-server-5.3,
            mariadb-server-5.5 (<< 5.5.33)
+Replaces: libmariadbclient18
+Provides: libmariadbclient18
 Description: MariaDB database client library
  MariaDB is a fast, stable and true multi-user, multi-threaded SQL database
  server. SQL (Structured Query Language) is the most popular database query
@@ -57,11 +59,23 @@ Description: MariaDB database client library
 Package: libmysqlclient18
 Section: libs
 Architecture: any
-Depends: libmariadbclient18 (= ${binary:Version}), ${misc:Depends}
+Depends: libmariadb3 (= ${binary:Version}), ${misc:Depends}
 Replaces: libmysqlclient18 (<< ${source:Version})
 Description: Virtual package to satisfy external depends
- This is an empty package that provides an updated "best" version of
+ This is an empty package that depends on the libmariadb3
- libmysqlclient18 that does not conflict with the libmariadbclient18
+ package.
+ .
+ MariaDB is a fast, stable and true multi-user, multi-threaded SQL database
+ server. SQL (Structured Query Language) is the most popular database query
+ language in the world. The main goals of MariaDB are speed, robustness and
+ ease of use.
+
+Package: libmariadbclient18
+Section: libs
+Architecture: any
+Depends: libmariadb3 (= ${binary:Version}), ${misc:Depends}
+Description: Virtual package to satisfy external depends
+ This is an empty package that depends on the libmariadb3
  package.
  .
  MariaDB is a fast, stable and true multi-user, multi-threaded SQL database
@@ -106,19 +120,20 @@ Description: MariaDB embedded database, shared library
 Package: libmariadbclient-dev
 Architecture: any
 Section: libdevel
-Depends: libmariadbclient18 (= ${binary:Version}),
+Depends: libmariadb3 (= ${binary:Version}),
          zlib1g-dev,
          ${misc:Depends},
          ${shlibs:Depends}
-Replaces: libmariadbclient16-dev, libmysqlclient16-dev
+Replaces: libmariadbclient16-dev, libmysqlclient16-dev, libmariadbclient-dev
-Conflicts: libmariadbclient16-dev,
+Conflicts: libmariadbclient-dev,
+           libmariadbclient16-dev,
            libmysqlclient-dev,
            libmysqlclient10-dev,
            libmysqlclient12-dev,
            libmysqlclient14-dev,
            libmysqlclient15-dev,
            libmysqlclient16-dev
-Provides: libmysqlclient-dev
+Provides: libmysqlclient-dev, libmariadbclient-dev
 Description: MariaDB database development files
  MariaDB is a fast, stable and true multi-user, multi-threaded SQL database
  server. SQL (Structured Query Language) is the most popular database query
@@ -153,7 +168,7 @@ Description: MariaDB database common files (e.g. /etc/mysql/conf.d/mariadb.cnf)
 
 Package: mariadb-client-core-10.2
 Architecture: any
-Depends: libmariadbclient18 (>= ${source:Version}),
+Depends: libmariadb3 (>= ${source:Version}),
          mariadb-common (>= ${source:Version}),
          ${misc:Depends},
          ${shlibs:Depends}
@@ -217,7 +232,7 @@ Description: MariaDB database core client binaries
 Package: mariadb-client-10.2
 Architecture: any
 Depends: debianutils (>=1.6),
-         libmariadbclient18 (>= ${source:Version}),
+         libmariadb3 (>= ${source:Version}),
          mariadb-client-core-10.2 (>= ${source:Version}),
          mariadb-common,
          ${misc:Depends},
@@ -271,7 +286,7 @@ Description: MariaDB database client binaries
 
 Package: mariadb-server-core-10.2
 Architecture: any
-Depends: libmariadbclient18 (>= ${binary:Version}),
+Depends: libmariadb3 (>= ${binary:Version}),
          mariadb-common (>= ${source:Version}),
          ${misc:Depends},
          ${shlibs:Depends}

debian/rules

@@ -72,7 +72,7 @@ override_dh_auto_configure:
 	# Remove symbols file on kFreeBSD builds so that
 	# dpkg-gensymbols will not fail the build.
 ifneq (,$(filter $(ARCH), kfreebsd-i386 kfreebsd-amd64))
-	rm debian/libmariadbclient18.symbols
+	rm debian/libmariadb3.symbols
 endif
 
 	mkdir -p $(BUILDDIR) && cd $(BUILDDIR) && \