modules.glusterfs.create(): avoid shadowing outer peer() function

************* Module salt.modules.glusterfs
salt/modules/glusterfs.py:116: [W0621(redefined-outer-name), create] Redefining name 'peer' from outer scope (line 43)
Merge pull request #13066 from cvrebert/patch-1

modules.glusterfs.create(): avoid shadowing outer peer() function