ASTERIXDB-1482: Added NCServiceExecutionIT, HyracksVirtualCluster. NCServiceExecutionIT runs all execution tests against a local cluster managed by the NCService deployment framework.
HyracksVirtualCluster offers programmatic NCService deployment control along with improved HyracksNCProcess/HyracksCCProcess.
Further fixes and improvements:
1. Fix handling of iodevices/storagedir (ASTERIXDB-1482) 2. Proper handling of [nc] default section in all cases 3. Ensure asterixnc, etc. scripts are executable 4. Consolidate Ini handling 5. Pruned some dead code, including VirtualClusterDriver 6. A bit of refactoring and extended commenting