Get rid of pycrypto dep

* ssh keys are generated with ssh-keygen now;
* most of the code is ported from nova.

Change-Id: I9cbf4bbff481c3a414b825abbe030ea27b7a2b63
Added Hive configuration, new nodeprocess - hiveserver

* Configuration hive-site.xml for Derby DB
* Added hive-default.xml
* Creating hive warehouse dir in HDFS
* Plugin validation exceptions

Implements blueprint edp-vanilla-plugin-hive-pig

Change-Id: I68b4f1307b8ff565d60d26c415eed1f553b8d5eb
Merge "Get rid of pycrypto dep"
Merge "Added Hive configuration, new nodeprocess - hiveserver"