https://bugzilla.redhat.com/show_bug.cgi?id=964358

Since neither getpwuid_r() nor initgroups() are safe to call in
between fork and exec (they obtain a mutex, but if some other
thread in the parent also held the mutex at the time of the fork,
the child will deadlock), we have to split out the functionality
that is unsafe.  At least glibc's initgroups() uses getgrouplist
under the hood, so the ideal split is to expose getgrouplist for
use before a fork.  Gnulib already gives us a nice wrapper via
mgetgroups; we wrap it once more to look up by uid instead of name.

* bootstrap.conf (gnulib_modules): Add mgetgroups.
* src/util/virutil.h (virGetGroupList): New declaration.
* src/util/virutil.c (virGetGroupList): New function.
* src/libvirt_private.syms (virutil.h): Export it.
Signed-off-by: NEric Blake <eblake@redhat.com>
(cherry picked from commit 75c12564)

Conflicts:
	bootstrap.conf - not updating gnulib submodule...
	configure.ac - ...so checking for getgrouplist by hand...
	src/util/virutil.c - ...and copying only the getgrouplist implementation rather than calling the gnulib function; also, file still named util.c
	src/libvirt_private.syms - context