Solved network validation memory leak.
Added 3 function to check network address range intersection.
fixed get_min_max_addr return type
added test
Satisfying pep8
Satisfying pep8 fix
import order changed in test_checknetworkstask
removed redundant type check, fixed docs for better autodoc
PRD-1556 / Restore full dependency list for building Fuel ISO

 * Provide the full list of required packages in the section on Fuel ISO
   (so that one doesn't have to retrace all sections just to build an
   image)
 * New tips on how to run individual test cases from the integration test suite
disable RSAAuthentication in VirtualBox scripts

The expect scripts connecting to VirtualBox VMs expect a password
authentication and will break if SSH offers a prompt for SSH key
password.
functions for ostf in http_client
Function to run, wait and assert OSTF tests
Run OSTF tests at the end of each test
Fixed pep8
Logical Architecture: use more specific names for components (Astute, Cobbler, Nailgun DB)
Overview of FuelWeb components in the Logical Architecture

 * Textual overview of FuelWeb components
 * Moved references to the inspiration blog posts from Sequence Diagrams
   to Logical Architecture
 * Logical Architecture diagram changed: Data Model isn't talking to
   Naily directly over AMQP
Ceph 0.61.8 Cuttlefish and dependencies (including QEMU 1.2)
Update fuel submodule to the tip of xarxes/ceph
disable external repos in Ceph manifest
Initial implementation of VG->plain partition conversion for Ceph support.
PRD-1538 / integration tests for Ceph (WIP)