TT#49552 Use Log::Log4perl->warn instead of waning

Change-Id: I5a4dd2df8a87604d40750f232f88b20a08d501dd
(cherry picked from commit 2b9b53e1d4e34213896c58955ad059586c392617)

lib/NGCP/Panel/Controller/Root.pm

@@ -509,7 +509,7 @@ sub _set_session_tz_from_row {
     $tz_name =~ s/^localtime$/local/ if $tz_name;
     eval { $c->session->{user_tz} = DateTime::TimeZone->new( name => $tz_name ); };
     if ($@) {
-        $c->log->warning("couldnt set timezone. error in creation probably caused by invalid timezone name. role $role ($identifier) to $tz_name");
+        $c->log->warn("couldnt set timezone. error in creation probably caused by invalid timezone name. role $role ($identifier) to $tz_name");
     } else {
         $c->session->{user_tz_name} = $tz_name;
         $c->log->debug("timezone set for $role ($identifier) to $tz_name");