Fix vmware_guest idempotency when using dvswitch (fixes #498)

[Yannik]

SUMMARY

This fixes the idempotency issue reported in #498 caused by nic.device.deviceInfo.summary containing DVSwitch: d5 6e 22 50 dd f2 94 7b-a6 1f b2 c2 e6 aa 0f instead of a readable portgroup name.

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

vmware_guest

[softwarefactory-project-zuul]

Build succeeded.
https://ansible.softwarefactory-project.io/zuul/buildset/85abde809e364f5a8c379f768d411835

✔️ ansible-tox-linters SUCCESS in 9m 40s
✔️ build-ansible-collection SUCCESS in 10m 32s
✔️ ansible-test-cloud-integration-vcenter7_only-stable216 SUCCESS in 21m 23s
✔️ ansible-test-cloud-integration-vcenter7_2esxi-stable216 SUCCESS in 21m 18s
✔️ ansible-test-cloud-integration-vcenter7_1esxi-stable216_1_of_2 SUCCESS in 1h 17m 49s
✔️ ansible-test-cloud-integration-vcenter7_1esxi-stable216_2_of_2 SUCCESS in 54m 04s
✔️ ansible-galaxy-importer SUCCESS in 4m 29s

[softwarefactory-project-zuul]

Build succeeded.
https://ansible.softwarefactory-project.io/zuul/buildset/2e54d13005a24f399e84bdbf0b9722e8

✔️ ansible-tox-linters SUCCESS in 10m 19s
✔️ build-ansible-collection SUCCESS in 10m 51s
✔️ ansible-test-cloud-integration-vcenter7_only-stable216 SUCCESS in 21m 38s
✔️ ansible-test-cloud-integration-vcenter7_2esxi-stable216 SUCCESS in 21m 23s
✔️ ansible-test-cloud-integration-vcenter7_1esxi-stable216_1_of_2 SUCCESS in 53m 48s
✔️ ansible-test-cloud-integration-vcenter7_1esxi-stable216_2_of_2 SUCCESS in 59m 46s
✔️ ansible-galaxy-importer SUCCESS in 9m 58s