alces service command completion can suggest invalid things

[bobwhitelock]

E.g. I can do this:

[root@node-x66(el7cluster) /]# alces service build<tab> 
alces-access-manager     alces-flight-www         aws                      galaxy                   simp_le
alces-flight-trigger     alces-storage-manager    clusterware-dropbox-cli  s3cmd                    slurm

But then if I select one of these not in the base repo I get this:

[root@node-x66(el7cluster) /]# alces service build alces-access-manager 
alces service build: service not found: base/alces-access-manager

This works though:

[root@node-x66(el7cluster) /]# alces service build private/alces-access-manager                                                                                                                                                                                                   
  >>> Loaded plugins: fastestmirror
  >>> Loading mirror speeds from cached hostfile
  >>>  * base: mirrors.clouvider.net