Merge pull request #445 from alinask/topic/set_want_fork_support_to_minus_one

initialize opal_common_verbs_want_fork_support to -1.

opal/mca/common/verbs/common_verbs_mca.c

@@ -20,7 +20,7 @@ static bool registered = false;
 static int warn_nonexistent_if_index = -1;
 
 bool opal_common_verbs_warn_nonexistent_if = true;
-int opal_common_verbs_want_fork_support = 1;
+int opal_common_verbs_want_fork_support = -1;
 
 static void register_internal(void)
 {