* xtests/tst-pam_group1.c: New test case for user compare in pam_group.
* xtests/tst-pam_group1.sh: Script to run test case.
* xtests/tst-pam_group1.pamd: Config for test case.
* xtests/Makefile.am: Add tst-pam_group1 test case.
* xtests/run-xtests.sh: Save/restore group.conf.
* xtests/group.conf: New.
* modules/pam_xauth/pam_xauth.c (pam_sm_open_session): Don't
free arguments used for putenv().
* doc/man/pam_putenv.3.xml: Document that application has to free
the memory.