Add changes in horizon docs

DocImpact

Directories in items 2.2 2.4 2.8 are corrected
Items 2.2 and 2.3 are swapped
Typos in items 2.7 2.8 3.2 are corrected

Change-Id: I666fc5ef445c787d4ea889c2eae576225778b10d
Some improvements to documentation were added

Inconsistencies in documentation (Savanna quickstart guide and Full installation guide) were corrected

Change-Id: I234484e0b52cbff0d1b894c4fc7b72bdea5eed1b
(cherry picked from commit e677fcc77787ee3f5109bfbda9a966ca9fddef7c)
Requires updated due to the openstack/requirements

* jsonschema is now >= 1.0.0
* flake8 and hacking is now limited by some versions

Change-Id: I1a8f060e3653d29936ec9835e720a020b48c4f5a
.gitignore updated

Change-Id: I916932d1f8be40852139723b215957bfc2a24be7
Merge "Requires updated due to the openstack/requirements"
Merge ".gitignore updated"
Updated project documentation.

- Added developer guide
- Added installation guide
- Removed screenshots of Horizon pages

Change-Id: I827e9dad490099b7825ed812452d89fc7d4d0e83
Removed unused paramter '-force' when formatting NameNode

Change-Id: I6f188ba7cd18835617f9e2bfcacb259295d49767
Merge "Removed unused paramter '-force' when formatting NameNode"
Merge "Updated project documentation."
Integration tests for hadoop were added.

HDFS commands of hadoop were verified.
Launch and successful completion of mapreduce job were verified.

Change-Id: I285ca653827ec6544367e44b875299e58bd070cb
Integration tests improvements and fixes.

cluster creation timeout has been increased;
node templates' flavors has been decreased.

Change-Id: I57dc8cfe631e49cd7120c986a2eacc4aa399433b
Small docs improvements.

* 'sphinxcontrib-httpdomain' added to test-requires
* info about how to add Savanna endpoints to Keystone added

Change-Id: I782096ca3471cbdabcc048c79a7198cb630a6c64
Merge "Integration tests improvements and fixes."
New hadoop tests were added

A Validation that a job was successfully run on all nodes was added

Change-Id: Ib2ae34d04be2abb183abe131d114181776ef8948
Replaced path to start-all.sh script.

* Now all scripts should be placed in PATH of every OS
* savanna-hdp-img-01 may not work with this change

Change-Id: I0e891d594378a8b96a38a99c062a7b705e84a222
Pre-release 0.1.2 doc changes

Change-Id: I7d1cc835522fff0a99015d21019a4aef6f3220f3
Merge "Replaced path to start-all.sh script."
Merge "New hadoop tests were added"
Merge "Pre-release 0.1.2 doc changes"