Read template's expected value orchest test Part-2

In tests under /tempest/api/orchestration/, resources gets
created based on parameters defined in template (yaml, json).
But while verification of output, expected values are hard coded
in tests.
Expected values should be read from template only.
This patch covers the following files -
    test_environment.py
    test_nova_keypair_resources.py
    test_swift_resources.py

Closes-Bug: #1327919

Change-Id: Ie241b7f299487cd0db384778225823e96fecf440
Merge "Read template's expected value orchest test Part-2"