Centos65 template openssh clients

the scp utility is part of ``openssh-clients`` on RHEL6.5.  Creating a box via veewee will otherwise fail:

```
2013-12-13 10:22:17 -0600 -  - [veewee] About to transfer /var/folders/_4/6rmjtyld26bfstcv7bnw0nd18hv2k7/T/.veewee_version20131213-56827-1fb0qhk to .veewee_version to the box CentOS-6.5-x86_64 - 127.0.0.1 - {:user=>"veewee", :port=>"7222", :password=>"veewee", :timeout=>10000}
2013-12-13 10:22:17 -0600 - ui - [veewee] Transferring /var/folders/_4/6rmjtyld26bfstcv7bnw0nd18hv2k7/T/.veewee_version20131213-56827-1fb0qhk to .veewee_version
Transferring /var/folders/_4/6rmjtyld26bfstcv7bnw0nd18hv2k7/T/.veewee_version20131213-56827-1fb0qhk to .veewee_version
2013-12-13 10:22:17 -0600 - ui - [veewee] Error transfering file /var/folders/_4/6rmjtyld26bfstcv7bnw0nd18hv2k7/T/.veewee_version20131213-56827-1fb0qhk failed, possible not enough permissions to write? SCP did not finish successfully (127)
Error transfering file /var/folders/_4/6rmjtyld26bfstcv7bnw0nd18hv2k7/T/.veewee_version20131213-56827-1fb0qhk failed, possible not enough permissions to write? SCP did not finish successfully (127)
2013-12-13 10:22:17 -0600 - ui - [veewee] SCP did not finish successfully (127)
SCP did not finish successfully (127)
```
```
$ scp -P 7222 veewee.gemspec veewee@localhost:/home/veewee/veewee.gemspec
The authenticity of host '[localhost]:7222 ([127.0.0.1]:7222)' can't be established.
RSA key fingerprint is 75:df:b5:06:71:f2:03:01:b4:6b:54:bb:9c:33:76:64.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '[localhost]:7222' (RSA) to the list of known hosts.
veewee@localhost's password:
bash: scp: command not found
lost connection
```