meta-agl-test: updates due to framework adjustment

meta-agl-test: updates due to framework adjustment

Due to the previous framework adjustment, the scripts for
running glib2 tests has been moved to 'agl-test-framework'.
And rpm will support its ptest later, and then its scripts
will also be placed under 'agl-test-framework'.
So 'agl-test-glib2.bb' and 'agl-test-rpm.bb' are no longer needed

The content under 'agl-test-framework' has changed,
so 'agl-test-framework.bb' has also been updated.

Bug-AGL: SPEC-4345

Signed-off-by: duerpei <duep.fnst@fujitsu.com>
Change-Id: Ia6dd71966e5ba18cbb5cb81fb594d4fc3722db27