migrate JBT and JBDS discovery plugins to new github repo, jbosstools-discovery

Migrate 2 3 branches of git sources (including history):

https://github.com/jbosstools/jbosstools-central/tree/master/central/plugins/org.jboss.tools.central.discovery
https://github.com/jbosstools/jbosstools-central/tree/jbosstools-4.1.0.Alpha1x/central/plugins/org.jboss.tools.central.discovery
OMIT: https://github.com/jbosstools/jbosstools-central/tree/jbosstools-4.0.x/central/plugins/org.jboss.tools.central.discovery

and 2 3 branches of svn sources (including history):

http://svn.jboss.org/repos/devstudio/trunk/product/plugins/com.jboss.jbds.central.discovery/
http://svn.jboss.org/repos/devstudio/branches/devstudio-7.0.0.Alpha1/product/plugins/com.jboss.jbds.central.discovery/
OMIT: http://svn.jboss.org/repos/devstudio/branches/devstudio-6.0.x/product/plugins/com.jboss.jbds.central.discovery/

to a new Github project called "jbosstools-discovery" under which there would be:

• jbdevstudio/com.jboss.jbds.central.discovery/
• jbosstools/org.jboss.tools.central.discovery/