Add mutate queries to fix missing usernames

[mvdbeek]

Either by setting the username to the lowercase first portion of the email address (which excludes any conflicts), or by setting the username to a uuid (you can use this for confictls).

[mvdbeek]

I've tested the queries individually, but the release script fails with

bash: -c: line 0: syntax error near unexpected token `('
bash: -c: line 0: `./.tmpgxadmin cluster slurm-stats() { ## --help'
config
bash: -c: line 0: syntax error near unexpected token `('
bash: -c: line 0: `./.tmpgxadmin config dump() { ## --help'
bash: -c: line 0: syntax error near unexpected token `('
bash: -c: line 0: `./.tmpgxadmin config validate() { ## --help'

so haven't pursued this any further.

[hexylena]

Thanks @mvdbeek I'll look into this.

[hexylena]

A new release doesn't need to be issued to get a new version, a github pre-release revision will be released automatically once this is merged that can be installed easily (also via ansible)

[hexylena]

https://github.com/galaxyproject/gxadmin/releases/tag/untagged-c8c813f51de5698ce366