Move gawk into general for post-config

Devstack script for setting post-config needs gawk.
So this patch moves gawk from files/*/nova into files/*/general.

Closes-Bug: #1909041
Change-Id: I06a1a5524f146a8d7337963e846b5a6b7561be13
diff --git a/files/rpms-suse/general b/files/rpms-suse/general
index 0de0876..f636110 100644
--- a/files/rpms-suse/general
+++ b/files/rpms-suse/general
@@ -3,6 +3,7 @@
 bc
 ca-certificates-mozilla
 curl
+gawk
 gcc
 gcc-c++
 git-core