JBIDE-13938 Improved Reddeer server requirements

- Added ServerReqState which is defining a state of the server (RUNNING, STOPPED or just PRESENT)
- Dealing with various situations like NoServerFound or ServerIsNotSet and errors that shows up in Add New Server dialog
- Added support for Wildfly (AS 8.0)
- Using versions 6.1 and 6.2 instead of 6.1+
- Reduced time of selecting server type by using server's category instead of searching the server in all items
- Handled running test suite against more config files