payload.py: rm now-unused import of OrderedDict

************* Module salt.payload
W0611: 15,0: Unused import OrderedDict
used by commented-out code that might eventually get re-enabled
utils.parsers: rm unused imports

************* Module salt.utils.parsers
W0611: 15,0: Unused import copy
W0611: 19,0: Unused import urlparse
W0611: 30,0: Unused import exceptions
Merge pull request #6182 from cvrebert/patch-3

payload.py: rm now-unused import of OrderedDict
Merge pull request #6183 from cvrebert/patch-4

utils.parsers: rm unused imports
jinja's Extension is actually new-style; reassure pylint & use modern super()

See comments on 96852d96ca0883bf06b518219c7af2fff41324dd
Merge pull request #6186 from cvrebert/patch-1

jinja's Extension is actually new-style; reassure pylint & use modern super
Merge branch 'develop' into with-pylint-pragmas