[libvirt] Pass additional environmental variables

We're using sasl+gssapi+kerberos to do authentication for libvirt, including from hypervisor to hypervisor. However, the environmental variable filtering implemented in libvirt prevents this from working, so we're forced to run a locally patched version. Thoughts on the following patch to pass the location of the local credential cache as well? --- a/src/util/vircommand.c 2014-01-07 14:14:11.388934108 +0000 +++ b/src/util/vircommand.c 2014-01-07 14:18:14.725082505 +0000 @@ -1314,6 +1314,7 @@ virCommandAddEnvPair(cmd, "LC_ALL", "C"); + virCommandAddEnvPassBlockSUID(cmd, "KRB5CCNAME", NULL); virCommandAddEnvPassBlockSUID(cmd, "LD_PRELOAD", NULL); virCommandAddEnvPassBlockSUID(cmd, "LD_LIBRARY_PATH", NULL); virCommandAddEnvPassBlockSUID(cmd, "PATH", "/bin:/usr/bin");