Fixed default text missing from network selection on instance wizard

[Spaceman1984]

Description

This PR fixes the missing "Default" display issue on the instance wizard when selecting a network.

Fixes: #3633

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)

Screenshots (if appropriate):

How Has This Been Tested?

This has been tested from the UI. First make sure that there are some available networks.
From the create instance wizard, complete all the steps until the network page. The text next to the radio button will read "Default".

[yadvr]

Manual testing needed, I didn't test it.

[DaanHoogland]

@blueorangutan package

[blueorangutan]

@DaanHoogland 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-773

[DaanHoogland]

code and test ok:

[blueorangutan]

Trillian test result (tid-917)
Environment: kvm-centos7 (x1), Advanced Networking with Mgmt server 7
Total time taken: 34137 seconds
Marvin logs: https://github.com/blueorangutan/acs-prs/releases/download/trillian/pr3865-t917-kvm-centos7.zip
Intermittent failure detected: /marvin/tests/smoke/test_affinity_groups_projects.py
Intermittent failure detected: /marvin/tests/smoke/test_affinity_groups.py
Intermittent failure detected: /marvin/tests/smoke/test_hostha_kvm.py
Smoke tests completed. 76 look OK, 3 have error(s)
Only failed tests results shown below:

Test	Result	Time (s)	Test File
test_DeployVmAntiAffinityGroup_in_project	Error	69.54	test_affinity_groups_projects.py
test_DeployVmAntiAffinityGroup	Error	37.65	test_affinity_groups.py
test_hostha_kvm_host_degraded	Failure	686.47	test_hostha_kvm.py
test_hostha_kvm_host_fencing	Failure	646.43	test_hostha_kvm.py
test_hostha_kvm_host_recovering	Failure	645.49	test_hostha_kvm.py

[yadvr]

Changes not related to smoketests failure. Merging based on @DaanHoogland 's testing.