Fix Test_NsxtSecurityGroupGetAssociatedVms

[Didainius]

This PR fixes Test_NsxtSecurityGroupGetAssociatedVms. The reason for its failure is that the test creates a standalone VM and a VM within a vApp using the same name in VCD 10.4.

Sample error before this fix:

START: nsxt_firewall_group_static_security_group_test.go:106: TestVCD.Test_NsxtSecurityGroupGetAssociatedVms
nsxt_firewall_group_static_security_group_test.go:128:
// VMs are prependend to cleanup list to make sure they are removed before routed network
standaloneVm := createStandaloneVm(check, vcd, nsxtVdc, routedNet)
nsxt_firewall_group_static_security_group_test.go:270:
check.Assert(err, IsNil)
... value *errors.errorString = &errors.errorString{s:"error creating standalone VM: API Error: 400: [ a355e5d1-be85-4bbe-89bd-28298b405da7 ] The VMware Cloud Director entity TestVCD.Test_NsxtSecurityGroupGetAssociatedVms already exists."} ("error creating standalone VM: API Error: 400: [ a355e5d1-be85-4bbe-89bd-28298b405da7 ] The VMware Cloud Director entity TestVCD.Test_NsxtSecurityGroupGetAssociatedVms already exists.")

FAIL: nsxt_firewall_group_static_security_group_test.go:106: TestVCD.Test_NsxtSecurityGroupGetAssociatedVms

[lvirbalas]

Few asks and LGTM:

• There's a typo in PR name.
• Would be nice to know exactly what has changed and in which CD version (and report that in the description). Would be good to know exact cause.

[Didainius]

• There's a typo in PR name.

Fixed.

• Would be nice to know exactly what has changed and in which CD version (and report that in the description). Would be good to know exact cause.

For example on 10.2.0.17008054 and 10.3.3.20027910 this test works without patch.