Flip the NSUPDATE_ZONE conditional status

Previously, the else was assumed to be the one where NSUPDATE_ZONE was
set. Flip this in order to facilitate adding additional nsupdate
configurations.

dnsapi/dns_nsupdate.sh

@@ -25,16 +25,16 @@ dns_nsupdate_add() {
   _info "adding ${fulldomain}. 60 in txt \"${txtvalue}\""
   [ -n "$DEBUG" ] && [ "$DEBUG" -ge "$DEBUG_LEVEL_1" ] && nsdebug="-d"
   [ -n "$DEBUG" ] && [ "$DEBUG" -ge "$DEBUG_LEVEL_2" ] && nsdebug="-D"
-  if [ -z "${NSUPDATE_ZONE}" ]; then
+  if [ -n "${NSUPDATE_ZONE}" ]; then
     nsupdate -k "${NSUPDATE_KEY}" $nsdebug <<EOF
 server ${NSUPDATE_SERVER}  ${NSUPDATE_SERVER_PORT} 
+zone ${NSUPDATE_ZONE}.
 update add ${fulldomain}. 60 in txt "${txtvalue}"
 send
 EOF
   else
     nsupdate -k "${NSUPDATE_KEY}" $nsdebug <<EOF
 server ${NSUPDATE_SERVER}  ${NSUPDATE_SERVER_PORT}
-zone ${NSUPDATE_ZONE}.
 update add ${fulldomain}. 60 in txt "${txtvalue}"
 send
 EOF
@@ -62,16 +62,16 @@ dns_nsupdate_rm() {
   _info "removing ${fulldomain}. txt"
   [ -n "$DEBUG" ] && [ "$DEBUG" -ge "$DEBUG_LEVEL_1" ] && nsdebug="-d"
   [ -n "$DEBUG" ] && [ "$DEBUG" -ge "$DEBUG_LEVEL_2" ] && nsdebug="-D"
-  if [ -z "${NSUPDATE_ZONE}" ]; then
+  if [ -n "${NSUPDATE_ZONE}" ]; then
     nsupdate -k "${NSUPDATE_KEY}" $nsdebug <<EOF
 server ${NSUPDATE_SERVER}  ${NSUPDATE_SERVER_PORT} 
 update delete ${fulldomain}. txt
+zone ${NSUPDATE_ZONE}.
 send
 EOF
   else
     nsupdate -k "${NSUPDATE_KEY}" $nsdebug <<EOF
 server ${NSUPDATE_SERVER}  ${NSUPDATE_SERVER_PORT}
-zone ${NSUPDATE_ZONE}.
 update delete ${fulldomain}. txt
 send
 EOF