Use openflighthpc commander

[ColonelPanics]

Currently the gemfile is using the old alces commander:

gem 'commander', github: 'alces-software/commander', tag: '4.4.4.alces3'

I suggest that we bring this in line with the other tools by using the openflighthpc commander package:

gem 'commander-openflighthpc', '~> 1.1.0'

A quick swap-out shows that there will be some ironing out of config needed from swapping between versions:

[root@localhost manage]# /opt/flight/bin/flexec bundle exec bin/manage list
manage: #<Commander::Runner:0x00000000029d58f8>