Test cases using common object (database,user,table,..) names could probably
destroy customer data, when connecting to an already running server.
This Changeset contains an auxiliary routine include/testdb_only.inc" which
should be sourced by tests doing such dangerous things.
The test case will get a "[skipped]" when the environment variable
USE_RUNNING_SERVER is not 0 .
The modified mysql-test-run.sh sets USE_RUNNING_SERVER to 0, when
the "mysql-test-run" starts its own server, aka there was no "--extern"
option.
mysql-test/mysql-test-run.sh:
If mysql-test-run spawns the server by itself, USE_RUNNING_SERVER will be set to 0 instead of "".
If the option "--extern" was detected, USE_RUNNING_SERVER will be set to 1 instead of "1".
Several comparisons have to be changed
[ -z "$USE_RUNNING_SERVER" ] --> [ $USE_RUNNING_SERVER -eq 0 ]
[ -n "$USE_RUNNING_SERVER" ] --> [ $USE_RUNNING_SERVER -eq 1 ]
USE_RUNNING_SERVER will be exported.
