Bug 1710901

Description of problem:
In UI, create VM dialog, Provision source: Import, 
VM Name validation error is reported only on the first issue found.
For example, for VM name: "Igor_vm",
It will display that upper case is not allowed,
and only after we turn the upper case to lower case,
It will display error on that under score is not allowed.

Same goes for the Disk name, that follow same limitations.

Version-Release number of selected component (if applicable):
hco tag: v.2.0.0-12

Expected results:
Option #1
Validation error for VM Name, and Disk name should be fully informative.
It can be something like:
"Only Lower case alphanumeric characters, ‘.’ or '-', start and end with an alphanumeric character", maximum length: 253 characters is supported"

Option #2
Run full validation on the typed name, to identify all compatibility problems, and report it from the first place, and not in stages, as it is done today.

For example, for VM name: "Igor_vm",
provide validation error:
"Upper case and underscore is not allowed."

I prefer Option #1, since it provides user full info on what is supported.