Description of problem:
This is an issue found when creating new Quay Repository, now Quay allow Repository name start with '_' ,'-' and '.'
But in Docker or skopeo, they don't allow repository name start with '_' ,'-' and '.', that means Quay should follow the same naming rules"

Version-Release number of selected component (if applicable):
Quay version: Quay v3.2.1-1
OCP Version:
oc get clusterversion
NAME VERSION AVAILABLE PROGRESSING SINCE STATUS
version 4.3.0-0.nightly-2020-03-10-182422 True False 21h Cluster version is 4.3.0-0.nightly-2020-03-10-182422

How reproducible:

Steps to Reproduce:
1.Login Quay console
2.Click create new Repository link
3.Input target Repository Name starting with '_' ,'-' and '.', like ".redhat1", "-redhat1" or "_redhat1"

Actual results:
The target Repository was created successfully.

Expected results:
Quay should block users creating new Repository.

Additional info:
See screenshots and command execution examples.