Introduce the server migration functionality for WildFly 11.0:

• WFLY 11.0 server module and its own pluggable migrations framework
• server migrations from all older supported WFLY servers
  • WFLY 8.2
  • WFLY 9.0
  • WFLY 10.0
  • WFLY 10.1
• feature pack for future integration in WFLY 11 distribution
• asciidoc user guides for WFLY 11 integrated tool distribution and all server migrations to WFLY 11.0