Added Create Server for Boot from volume V1

* Added check for keypair entity availability
* Initialization of files
* Added spaces for better readability

Change-Id: I76eb0b4e805407ee8a671f791f2eb2c0669e5d49
Snapshots glance and blockstorage changes

* New tests for V1 boot from volume snapshot scenarios
* Fixes in V2 snapshots scenarios
* PEP8 fixes
* Added extra lines and remove assignment to local variable as not needed

Change-Id: Ia640085a3ed0e3c3935b6a6d3f19402e5b62a574
Merge "Added Create Server for Boot from volume V1"
Merge "Snapshots glance and blockstorage changes"