Add a get_int method to RhsmConfigParser

get_int verifies the value is an int, useful
for things like port numbers.
Merge pull request #60 from candlepin/alikins/912776_config_get_int

Add a get_int method to RhsmConfigParser
Automatic commit of package [python-rhsm] release [1.8.6-1].
Merge branch 'master' into awood/server-side-status