Add a check to limit the length of the environment prefix add_environment tool

[richbrowne]

There is a limit to the string length of an environment prefix, but this is not documented and not checked in the tool that generates new environments. Add a string length check to the tool.

Agent Version

8.0.2.b1

Operating System

Any

OpenStack Release

Liberty and beyond

Bug Severity

For bugs enter the bug severity level. Do not set any labels.

Severity: 4

Severity level definitions:

1. Severity 1 (Critical) : Defect is causing systems to be offline and/or nonfunctional. immediate attention is required.
2. Severity 2 (High) : Defect is causing major obstruction of system operations.
3. Severity 3 (Medium) : Defect is causing intermittent errors in system operations.
4. Severity 4 (Low) : Defect is causing infrequent interuptions in system operations.
5. Severity 5 (Trival) : Defect is not causing any interuptions to system operations, but none-the-less is a bug.

Description

Need to Add check to the add_environment tool and document it in the script.

[dflanigan]

@richbrowne , Please document the limitation here in the bug so reference this issue in the release notes.