There was no way to see if report-{host,port,user,password} were set up.
Fixed with introducing new global variables.
The variables are made read-only because of a possible need to change them
most probably require the slave server restart.
Todo: transform the startup options to be CHANGE master parameters - i.e
to deprecate `report-' options, and to change the new vars
to be updatable at time of CHANGE master executes with new
values.
sql/set_var.cc:
Adding associations of the server init arguments with the new global read-only
variables.
mysql-test/suite/rpl/r/rpl_report.result:
new results file
mysql-test/suite/rpl/t/rpl_report-slave.opt:
options initialize the new global variables.
mysql-test/suite/rpl/t/rpl_report.test:
The new test to check SHOW-ability and SELECT-ablity for the report
global vars.
