logging improvements, be not so verbose by default

ngcp-update-db-schema

@@ -1,5 +1,7 @@
 #!/bin/bash
 
+VERBOSE=no
+
 # do not rely on hostname(1), might return hostname of the
 # deployment system when initially deploying via chroot
 if [ -r /etc/hostname ] ; then
@@ -62,10 +64,10 @@ fi
 running_on_active_node() {
   if [ -x /usr/sbin/ngcp-check_active ] ; then
     if /usr/sbin/ngcp-check_active -q ; then
-      echo "This seems to be the active node, nothing to do."
+      [ "$VERBOSE" != no ] && echo "This seems to be the active node, nothing to do."
       return 0
     else
-      echo "This seems to be the inactive node, applying revisions."
+      [ "$VERBOSE" != no ] && echo "This seems to be the inactive node, applying revisions."
       return 1
     fi
   else
@@ -84,11 +86,12 @@ apply_revision() {
     echo done
   else
     echo "failed. :("
+    echo "Please resolve the problem and run ngcp-update-db-schema again."
     exit 1
   fi
 
   if mysql -usipwise -p${SIPWISE_DB_PASSWORD} ngcp -e "insert into db_schema values (0, '${revname}', \""${hostname}"\", CURRENT_TIMESTAMP);" ; then
-    echo "Marked revision $rev as applied."
+    [ "$VERBOSE" != no ] && echo "Marked revision $rev as applied."
   else
     echo "Error while executing DB commands using revision $rev for host $hostname" >&2
     exit 1