Description:
If delete a container just with name contains the first 4 letters(like rock here, sudo gear delete rock), the first contains which matches with the 4 letters in name will be deleted successfully, but unexpected warnings appears:delete_container: Unable to queue stop unit job: Unit ctr-rock.service not loaded. Deleted rock; 

But if delete with first 3 letters in name(sudo gear delete roc), it fails and valid warning returns like this:You must pass one or more valid service names: identifier must match \A[a-zA-Z0-9\_\-\.]{4,24}\z

Version-Release number of selected component (if applicable):
geard-0-0.13.git6850c8d
fedora20_x86_64

How reproducible:
always

steps to Reproduce:
1. Create a rockmongo.json file to deploy with below contents:
{
  "containers":[
    {
      "name":"rockmongo",
      "count":3,
      "image":"openshift/centos-rockmongo",
      "publicports":[
        {"internal":80, "external":0}
      ],
      "links":[
        {"to":"mongodb"}
      ]
    }
  ]
}
2. sudo gear deploy rockmongo.json
3. sudo gear list-units
ID          SERVER  ACTIVE  SUB     LOAD    TYPE
rockmongo-1         active  running loaded  
rockmongo-2         active  running loaded  
rockmongo-3         active  running loaded 
4. delete with the first 4 letters: rock
sudo gear delete rock
5. stop a container
sudo gear stop rockmongo-1
6. sudo gear delete rock
7. the first contianer begin with rock will be deleted:
sudo gear list-units
ID          SERVER  ACTIVE  SUB     LOAD    TYPE
rockmongo-2         active  running loaded  
rockmongo-3         active  running loaded 

Actual results:
In step 4, this warning appears, nothing is deleted:
delete_container: Unable to queue stop unit job: Unit ctr-rock.service not loaded.
Deleted rock
After step 6, rockmongo-1 is deleted and above warning appears too

Expected results:
1. It should warn like this when delete with first 3 letters:
[vagrant@localhost ~]$ sudo gear delete roc
You must pass one or more valid service names: identifier must match \A[a-zA-Z0-9\_\-\.]{4,24}\z
2. If we intend to delete all contians sharing some same beginning letters in name, we should use wildcards, for example "*".

Additional info:
1. If all rockmongo-* in list are stoped, the warning still appears and they will be all deleted.
2. If delete a non-exist container, the same warning appears and says it is deleted:
[vagrant@localhost ~]$ sudo gear delete 1234
delete_container: Unable to queue stop unit job: Unit ctr-1234.service not loaded.
Deleted 1234