kvm: use libvirtd as service name for all distributions

[rohityadavcloud]

Since we support only Ubuntu 16.04+ on master/4.12+, we can now use
the libvirt service name libvirtd for all distributions. This also
fixes an optional package name for libvirtd installation on Debian 9+.
Fixes #2909

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)

[rohityadavcloud]

@blueorangutan package

[blueorangutan]

@rhtyd a Jenkins job has been kicked to build packages. I'll keep you posted as I make progress.

[blueorangutan]

Packaging result: ✔centos6 ✔centos7 ✔debian. JID-2373

[rohityadavcloud]

@blueorangutan test

[blueorangutan]

@rhtyd a Trillian-Jenkins test job (centos7 mgmt + kvm-centos7) has been kicked to run smoke tests

[blueorangutan]

Trillian test result (tid-3113)
Environment: kvm-centos7 (x2), Advanced Networking with Mgmt server 7
Total time taken: 28751 seconds
Marvin logs: https://github.com/blueorangutan/acs-prs/releases/download/trillian/pr2925-t3113-kvm-centos7.zip
Intermittent failure detected: /marvin/tests/smoke/test_multipleips_per_nic.py
Intermittent failure detected: /marvin/tests/smoke/test_vpc_redundant.py
Intermittent failure detected: /marvin/tests/smoke/test_vpc_vpn.py
Smoke tests completed. 67 look OK, 2 have error(s)
Only failed tests results shown below:

Test	Result	Time (s)	Test File
test_nic_secondaryip_add_remove	Error	34.87	test_multipleips_per_nic.py
test_04_rvpc_network_garbage_collector_nics	Failure	508.63	test_vpc_redundant.py

[rohityadavcloud]

@blueorangutan test

[blueorangutan]

@rhtyd a Trillian-Jenkins test job (centos7 mgmt + kvm-centos7) has been kicked to run smoke tests

[blueorangutan]

Trillian test result (tid-3126)
Environment: kvm-centos7 (x2), Advanced Networking with Mgmt server 7
Total time taken: 24528 seconds
Marvin logs: https://github.com/blueorangutan/acs-prs/releases/download/trillian/pr2925-t3126-kvm-centos7.zip
Intermittent failure detected: /marvin/tests/smoke/test_multipleips_per_nic.py
Intermittent failure detected: /marvin/tests/smoke/test_ssvm.py
Intermittent failure detected: /marvin/tests/smoke/test_vpc_redundant.py
Intermittent failure detected: /marvin/tests/smoke/test_host_maintenance.py
Smoke tests completed. 66 look OK, 3 have error(s)
Only failed tests results shown below:

Test	Result	Time (s)	Test File
test_nic_secondaryip_add_remove	Error	31.86	test_multipleips_per_nic.py
test_04_rvpc_network_garbage_collector_nics	Failure	506.25	test_vpc_redundant.py
test_02_cancel_host_maintenace_with_migration_jobs	Error	1.38	test_host_maintenance.py

[wido]

LGTM