coverage increment for kolla

Current Coverage for kolla is 63% which is needs to be imroved to 80-85% for standard coding style and project deliverables.

=================================================================================
Ran 36 tests in 0.206s (-0.004s)
PASSED (id=1, skips=12)
cover runtests: commands[1] | coverage report --show-missing
Name Stmts Miss Cover Missing
-----------------------------------------------------------------
kolla/__init__.py 4 0 100%
kolla/cmd/__init__.py 0 0 100%
kolla/cmd/build.py 15 2 87% 24, 39
kolla/common/__init__.py 0 0 100%
kolla/common/config.py 34 1 97% 523
kolla/common/task.py 16 5 69% 26, 29, 33, 37, 42
kolla/exception.py 9 0 100%
kolla/hacking/__init__.py 0 0 100%
kolla/hacking/checks.py 13 2 85% 39-40
kolla/image/__init__.py 0 0 100%
kolla/image/build.py 659 325 51% 46, 66-67, 99-115, 129, 157, 159, 161, 165, 175-177, 181, 185-186, 200, 207-214, 221, 227-232, 249, 258-272, 288-337, 359, 363-366, 372-374, 379-382, 384-386, 390-398, 415-432, 445-448, 451-482, 492, 525, 538-552, 566, 575-577, 588, 594, 610-615, 664-671, 695, 702, 719, 724-726, 737-779, 782-795, 805, 855-870, 873-874, 884-885, 890-897, 905-914, 922-938, 947-1021
kolla/opts.py 3 3 0% 13-17
kolla/template/__init__.py 0 0 100%
kolla/template/filters.py 12 10 17% 20-29
kolla/template/methods.py 14 13 7% 34-63
kolla/tests/__init__.py 0 0 100%
kolla/tests/base.py 18 0 100%
kolla/tests/common/__init__.py 0 0 100%
kolla/tests/common/test_config.py 5 0 100%
kolla/tests/test_build.py 170 2 99% 202, 220
kolla/tests/test_hacking.py 12 0 100%
kolla/version.py 2 0 100%
-----------------------------------------------------------------
TOTAL 986 363 63%
______________________________________________________________ summary _______________________________________________________________
  cover: commands succeeded
  congratulations :)
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