vic-machine support resources in folder

[emlin]

#For stories, please include the information below:

User Statement:

As a vic admin, I want to user vic-machine to create and manage VCH endpoint VM with resources under VC folders.

Details:
following changes for vic-machine create

1. --target option will have dc folder specified, e.g. "vc ip"/folder/dc, and it's also possible to be "vc ip"/dc (even the dc is under folder), and also "vc ip"/folder valid, in which case, there is only one dc in that folder.
2. --compute-resource, with same reason, it will be folder/cluster, folder/rp (in case there is only one cluster in that folder), cluster, or cluster/rp, four possible format.
3. The storage options. It already have a format as datastore/path, and it's ok to leave path empty, but this change, it will vary as well. User might specify folder/datastore/path, folder/datastore, or datastore/path.
4. network options are usually only name specified, that is easy in this change.
5. resource suggestion includes folders

Other vic-machine commands should all support search with name through govmomi

Acceptance Criteria:
Following test should be included:

• Specify resources with all supported formats, to create VCH
• Wrong resource name will get correct resource suggestion for resources under folder

[emlin]

Depends on #3620 , so set it to low priority

[dougm]

Trying this with #3620 merged:

• Need a small change to support datacenter name in target without the folder path

• We should be able to use a host or cluster by name, without the full path for --compute-resource, but is currently hardcoded to append "Resources" if path is not absolute

• Datastore suggestion/validation works as-is when datastore lives in a folder and just the name is given

• Network suggestion/validation works as-is when network lives in a folder and just the name is given

• Resource suggestion works when Host/Cluster is inside a folder (but currently needs the full path to validate as mentioned above)

[stuclem]

@mdubya66 does this really need to go in the release notes?

[stuclem]

Removing kind/note

[hickeng]

@dougm please add references to the commits that addressed this.

[dougm]

The remaining issues here were fixed by the changes for #4203