Add more templates to 'rhev-template-update.py'

This is a simple change which adds 3 more supported templates to the
'rhev-template-update.py' script. The templates added are:

    * CentOS-6.5-x86_64-minimal
    * Fedora-19-x86_64-netinst
    * Fedora-20-x86_64-netinst

Signed-off-by: Prakash Surya <surya1@llnl.gov>
Add '--arp' option to 'rhev-template-claone.py'

The 'rhev-template-clone.py' script was modified to accept a new option,
'--arp'. This new option is only valid when combined with '--boot'.

When '--arp' is used, the script will try and determine the new VM's IP
address that was given to it from the dhcpd server. It does this by
using the 'arp -n' command to map the VM's MAC address to its newly
assigned IP address.

Signed-off-by: Prakash Surya <surya1@llnl.gov>