Get unix_sock_group & config_sys as an option

- unix_sock_group: libvirt 3.x from UCA repo by default uses
  "libvirt" group for socket ownership, so get the name
  of the group from pillar if given.
- config_sys: handle sysconfig file location
  defined in parameters.

Change-Id: I06dd3707efc191a81af1cf60d8dbeef4e9ea5964
diff --git a/tests/pillar/simple.sls b/tests/pillar/simple.sls
index 0cb2712..bb70d2a 100644
--- a/tests/pillar/simple.sls
+++ b/tests/pillar/simple.sls
@@ -1,8 +1,9 @@
 libvirt:
   server:
     enabled: true
+    unix_sock_group: libvirtd
     virtualizations:
     - kvm
     network:
       default:
-        ensure: absent
\ No newline at end of file
+        ensure: absent