Return imgadm version

    CLI Example:

    .. code-block:: bash

        salt '*' imgadm.version

def version():
    '''
    Return imgadm version

    CLI Example:

    .. code-block:: bash

        salt '*' imgadm.version
    '''
    ret = {}
    cmd = 'imgadm --version'
    res = __salt__['cmd.run'](cmd).splitlines()
    ret = res[0].split()
    return ret[-1]