Keep LC_*, LANG, set default LC_CTYPE
Python 3.6 and earlier Python 3 require a correctly configured locale to
support non-ASCII values for file names and other parameters. Certmonger
now passes down LANG and LC_* env vars. It also sets LC_CTYPE=C.UTF-8 as
default in case no LC_CTYPE is set.
Fixes: https://pagure.io/certmonger/issue/94
Signed-off-by: Christian Heimes <cheimes@redhat.com>