BUG#24593771:REMOVE TESTS THAT NEED GROUP REPLICATION PLUGIN

There are some tests in mysql-5.7 and mysql-trunk which can only run with
group replication plugin. These are all skipped because group replication is
not yet pushed to the main trees. These tests should be moved to GR
development tree

mysql-test/suite/rpl/t/rpl_group_replication_user.test
mysql-test/suite/rpl/t/rpl_group_replication_wait_for_executed_gtid_set_no_tim
eout.test
mysql-test/suite/rpl/t/rpl_group_replication_wait_for_executed_gtid_set_with_s
leep.test

These tests were move to group_replication suite on BUG#24357947: MOVE TESTS
THAT NEED GR PLUGIN TO GROUP REPLICATION TREE, on this bug we need to remove
them from rpl suite.
This is made in two steps because Group Replication is not on the main branch
yet.

Author: Anibal Pinto