Load distutils on all platforms EXCEPT Solaris.

Solaris doesn't ship distutils with with the default Python package.  This patch fixes "service" on Solaris since 30d6713.

system/service.py

@@ -106,7 +106,8 @@ import select
 import time
 import string
 
-if platform.system() == 'Linux':
+# The distutils module is not shipped with SUNWPython on Solaris.
+if platform.system() != 'SunOS':
     from distutils.version import LooseVersion
 
 class Service(object):