NovaCloudController test cases

[lourot]

https://launchpad.net/bugs/1828424

[lourot]

CI runs: https://review.opendev.org/720658

[codecov-io]

Codecov Report

Merging #233 into master will decrease coverage by 0.31%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #233      +/-   ##
==========================================
- Coverage   20.85%   20.53%   -0.32%     
==========================================
  Files         129      129              
  Lines        7079     7189     +110     
==========================================
  Hits         1476     1476              
- Misses       5603     5713     +110     

Impacted Files	Coverage Δ
zaza/openstack/charm_tests/nova/tests.py	0.00% <0.00%> (ø)
zaza/openstack/charm_tests/test_utils.py	0.00% <ø> (ø)

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[dshcherb]

Here's a summary after reviewing compared to https://github.com/openstack/charm-nova-cloud-controller/blob/65ed6620c7594cac914d21c2203742f63dc43d17/tests/basic_deployment.py#L74-L1045:

test_100_services - reworked (test_106_compute_catalog_endpoints)
test_102_service_catalog - reworked (test_106_compute_catalog_endpoints)

test_106_ec2_api_endpoint - N/A
test_108_s3_api_endpoint - N/A
test_110_memcache - N/A (do we assume that there are higher-level tests?)

test_200_nova_cc_shared_db_relation - N/A (assuming that we have higher-level tests)
test_202_mysql_shared_db_relation- N/A (assuming that we have higher-level tests)
test_204_nova_cc_identity_service_relation - N/A (assuming that we have higher-level tests)
test_206_keystone_identity_service_relation - N/A (assuming that we have higher-level tests)
test_208_nova_cc_amqp_relation - N/A (assuming that we have higher-level tests)
test_210_rabbitmq_amqp_relation - N/A (assuming that we have higher-level tests)
test_212_nova_cc_cloud_compute_relation - N/A (assuming that we have higher-level tests)
test_214_nova_cloud_compute_relation - N/A (tests for nova-compute validate this)
test_216_nova_cc_image_service_relation - N/A (assuming that we have higher-level tests that validate this better than this test case)
test_218_glance_image_service_relation - N/A (assuming that we have higher-level tests that validate glance)

test_302_api_rate_limiting_is_enabled - rewritten
test_310_pci_alias_config - rewritten

test_400_image_instance_create - already covered by tests enabled in charm-nova-compute (LTSGuestCreateTest et al.)
test_901_pause_resume - already there
test_900_restart_on_config_change - already there