Merge dhcp_checker into network_checker

Related to blueprint combined-network-checker-and-dhcpchecker

Change-Id: Ie6bdfdb326b4f887f9a2a36a6a2b240cefd7f11b
Ability to run OSTF against user defined deployment

In order to run certain OSTF test multiple time you
need to set DEPLOYMENT_NAME environment variable.
Other variables should be set same way as in ordinary
system tests run.

Change-Id: I6cf70270acb2fd9deca1efd7eb6caad36b77daf8
Simple with cinder in one case

Change-Id: Ie2bda76d86b2dc5081ad6bb5359e4b6c0d96b2c2
Delete node / delete environment should use env snapshot

It turned out there is no need to deploy simple environment
for delete xxx tests.

Change-Id: I518f861ffa8955bbe29013ca9313641a1f82fef3
Set timeout for OSTF savana tests in deploy_savanna_simple

Change-Id: I883a4eff2f4ced3ba51162d2b4c6306603846d4c
Merge "Merge dhcp_checker into network_checker"
Merge "Delete node / delete environment should use env snapshot"
Merge "Set timeout for OSTF savana tests in deploy_savanna_simple"
Merge "Ability to run OSTF against user defined deployment"
Added headless running of chrome for server without X

Change-Id: Ie8c5f9a504782e70b4c14b810d5b94666af93905
Merge "Added headless running of chrome for server without X"
Logging to multiple destination

Change-Id: Idc26893e618054dcd958f8fc9b4c804634950e6e
Console handler should be added to root logger

Change-Id: I60967eee13c94508b4589e686e6584f472fdc54f
Use logger for messaging

Change-Id: I229f5e8f9ea3c23adfc0bd9a821f103c76d776df
Create default log dir

Change-Id: Ifaeeef013291adf649e303ff24ece00108dd6c4a
Merge "Console handler should be added to root logger"
Merge "Use logger for messaging"
Added necessary build requirements to the fuelmenu and fuelclient spec files

Change-Id: I2f86cafbb6e8b926513ce8f80c3e238fa9d4a4ba
Additional logger.info calls

Change-Id: Ie77a3cddc90cac3e5904a3a5ac2356aa9635d51a
Rename savanna to sahara in cluster settings

Dictionary key (cluster settings) was changed to sahara.

Change-Id: If792b559605d86e7fd519470e4cc7bc16ae88dac