Refactor of test_network_basic_ops -prep new tests

    This is the preparatory work that enables new tests to be added which
    can re-use code currently in test_network_basic_ops. It pulls out a
    number of methods to a common library.

    Implements: blueprint quantum-quota-basic-tests quota tests
    Change-Id: I57336acd038cb70b6e9d8025b9c9e01d72475768

Change-Id: I6b916d4d15f4af05882a0ff0f384907d5bf3360c
Add properties to CreateRegisterImagesTest case

Adding a properties dict to the test_images CreateRegisterImagesTest
test case.

Change-Id: I46eea7b6d05adc61722447787a3e01b46597c23f
Remove unused imports

Removing the unused imports.

Change-Id: I30caa85b51a3cf969f6a1dfa8920be8d809cf257
Merge "Remove unused imports"
Merge "Refactor of test_network_basic_ops -prep new tests"
Merge "Add properties to CreateRegisterImagesTest case"