/etc/hosts generator implemented

* small refactoring of cluster_ops.py;
* /etc/hosts is now generated for each node with all cluster nodes in it.

Change-Id: Ic30f5897f39f6782cc6edf13beb64783ed12e427
Fixes: bug #1168102
Validation for required process props added

Change-Id: I9a8c5d19fcccffa7831a30a47cecb3a1c654387e
Fixes: bug #1165008
Index page updated.

DocBuild

Change-Id: Ifbed8143c433d46aa8030beec4eba43919649f19
tools/install_venv fixed

Change-Id: I1b6dd5f7951f6209b99c877551007af4ddd1ca59
Some large (and slow) validation tests has been splitted to several cases.

Change-Id: I3aabaa7432c9f0487329a62088b4e5e0bb393523
OpenStack Common has been updated to the latest version

Change-Id: I798514ca6f02d208bce02d51867777cc4271ae04
Implements integration tests

* Added basic integration tests for cluster and node_templates Savanna API actions

Change-Id: I1b5e080a75690c37d89a9c9697cd78883a59045d
Fixes: bug #1170426
docs fixed, tool renamed

Change-Id: I6ded43854476044c40c805b60b458bcbf0517d27
Using clear_override in tearDown.

Change-Id: If4ae1ba9dd70c69cbf162ca1c418bee6967e12f9
Merge "OpenStack Common has been updated to the latest version"