Add 'rhev-template-list.py' script

Added a new script to easily display a list of available templates. An
example usage is below:

    $ ./rhev-template-list.py -s SERVER -u USER -W

The command will print the names of the Templates to stdout and then
return.

Signed-off-by: Prakash Surya <surya1@llnl.gov>
Add 'rhev-template-delete.py' script

Added a new script to easily delete a template. An example usage is below:

    $ ./rhev-template-delete.py -t TEMPLATE

The command will delete the Template specified and return.

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