Move administrative messages for GerritServer to server config page

New server configuration cannot update administrative message area
dynamically. In addition, message is increased in proportion to the
number of GerritServer. It is hard to see.

This patch moves messages for server to server config page.
Indicate warnings or errors on edit button in gerrit management page

After moving messages to server config page, no server warning or error
status is shown in gerrit management page.

This patch indicates server status except connect/disconnect to config
edit button.
Add JSLint task to compile phase

To keep JavaScript secure, JSLint task is added.
In addition, fix gerrit-search.js to prevent lint error.
Prevent that pseudo mode is set during connection

If pseudo mode was set during connection, its server cannot be disconnected.

This patch prevents to set pseudo mode during connection.