Description of problem:
The error message is not accurate

Version-Release number of selected component (if applicable):
6.1 beta

How reproducible:
Always

Steps to Reproduce:
1. Go to Configure -> Environments -> New Environment
2. Enter an invalid name e.g Test Servers
3. 

Actual results:
Web UI reports "is alphanumeric and cannot contain spaces"

Expected results:
should say "is alphanumeric or underscore and cannot contain spaces"

Additional info:
Underscores are permitted (and used extensively by Satellite) buy adding this it makes it clearer that hyphens are not permitted