avoid shadowing set built-in type in memcached state

************* Module salt.states.memcached
salt/states/memcached.py:27: [W0622(redefined-builtin), set] Redefining built-in 'set'
Merge pull request #9162 from cvrebert/patch-1

avoid shadowing set built-in type in memcached state
modules.test.arg_type: avoid shadowing outer arg() func

************* Module salt.modules.test
salt/modules/test.py:202: [W0621(redefined-outer-name), arg_type] Redefining name 'arg' from outer scope (line 173)
avoid bare `except:`s in grains/external_ip.py

************* Module salt.grains.external_ip
salt/grains/external_ip.py:4: [W0702(bare-except), ] No exception type(s) specified
salt/grains/external_ip.py:18: [W0702(bare-except), external_ip] No exception type(s) specified
Merge pull request #9167 from cvrebert/patch-2

avoid bare `except:`s in grains/external_ip.py
utils/validate/ssh.py: rm unused import of CommandExecutionError

************* Module salt.utils.validate.ssh
salt/utils/validate/ssh.py:14: [W0611(unused-import), ] Unused import CommandExecutionError
Merge pull request #9168 from cvrebert/patch-3

utils/validate/ssh.py: rm unused import of CommandExecutionError
Merge pull request #9163 from cvrebert/patch-1

modules.test.arg_type: avoid shadowing outer arg() func
fix trailing whitespace, invalid backslash escapes, use of double quotes in debian_ip mod
Merge pull request #9164 from hulu/deb-ip

fix trailing whitespace & invalid backslash escapes in debian_ip mod
Merge branch 'develop' into with-pylint-pragmas