tops/reclass_adapter.py: string.find(X) > -1 ==> X in string
pillar/reclass_adapter.py: string.find(X) > -1 ==> X in string
salt/utils/yamlloader.py: fix typos in comments
modules/yumpkg5.py: rm unused import of `os`

************* Module salt.modules.yumpkg5
W0611:  9,0: Unused import os
cli/caller.py: rm unused import of `yaml`

************* Module salt.cli.caller
W0611: 29,0: Unused import yaml
Merge pull request #6017 from cvrebert/patch-5

cli/caller.py: rm unused import of `yaml`
Merge pull request #6016 from cvrebert/patch-3

modules/yumpkg5.py: rm unused import of `os`
Merge pull request #6015 from cvrebert/patch-4

salt/utils/yamlloader.py: fix typos in comments
Merge pull request #6011 from cvrebert/patch-2

pillar/reclass_adapter.py: string.find(X) > -1 ==> X in string
Merge pull request #6010 from cvrebert/patch-1

tops/reclass_adapter.py: string.find(X) > -1 ==> X in string