Strict standards compliance in unit test group extensions

git-svn-id: https://buddypress.svn.wordpress.org/trunk@7490 cdf35c40-ae34-48e0-9cc9-0c9da1808c22
Remove duplicate add_user_to_group() utility method from unit test suite

git-svn-id: https://buddypress.svn.wordpress.org/trunk@7491 cdf35c40-ae34-48e0-9cc9-0c9da1808c22