avoid shadowing outer clone() func in modules.lxc.init()

************* Module salt.modules.lxc
salt/modules/lxc.py:227: [W0621(redefined-outer-name), init] Redefining name 'clone' from outer scope (line 355)
Merge pull request #11364 from hulu/clones

avoid shadowing outer clone() func in modules.lxc.init()