Trim server name aliases

Issue

Server name containing spaces at their ends are not easy to notice and does not match, so this simple mistake can bring down entire website in a farm.

These names should be trim at save and/or during search...

The code to create new wikis is located in https://github.com/xwiki/xwiki-platform/blob/master/xwiki-platform-core/xwiki-platform-wiki/xwiki-platform-wiki-ui/xwiki-platform-wiki-ui-mainwiki/src/main/resources/WikiManager/CreateWiki.xml
The code to edit wiki descriptors in on https://github.com/xwiki/xwiki-platform/blob/master/xwiki-platform-core/xwiki-platform-wiki/xwiki-platform-wiki-ui/xwiki-platform-wiki-ui-mainwiki/src/main/resources/XWiki/XWikiServerClassSheet.xml

Links

• https://github.com/xwiki/xwiki-platform
• https://github.com/xwiki/xwiki-platform/blob/master/xwiki-platform-core/xwiki-platform-wiki/