TT#37257 Fix d2afaf9: allow installing plain Debian systems (without NGCP)

deployment.sh can install plain Debian systems (without NGCP),
in commit d2afaf9 such functionality has been lost. Fixing it here.

Change-Id: I883ef3c69c67cc04ae796c373f3b52d75780b4de
(cherry picked from commit 83197ef669)

templates/scripts/includes/deployment.sh

@@ -399,6 +399,10 @@ elif checkBootParam ngcppro || checkBootParam ngcpsp1 || checkBootParam ngcpsp2
   else
     ROLE=sp1
   fi
+elif checkBootParam "nongcp" ; then
+  # installing plain debian without NGCP
+  NGCP_INSTALLER_EDITION_STR=""
+  SIPWISE_APT_KEY_URL_PATH="/spce/sipwise.gpg"
 elif checkBootParam "puppetenv=" ; then
   # will be determined later
   :