882459: aftermath of bug 876753 - Change --heal-interval to --attach-interval in rhsmcertd
Old version of config entries considered to make changes backwards compatible

certFrequency becomes certCheckInterval
healFrequency becomes autoAttachInterval
Just use 0 as error for reading int keys

We fall back to default if these values are 0, so
simpler this way. Also, avoid compare of int and Null.
Merge branch 'master' into wottop/882459

Conflicts:
	subscription-manager.spec
Merge pull request #494 from candlepin/alikins/882459_warning_cleanup

Just use 0 as error for reading int keys
correct typos
Merge pull request #490 from candlepin/wottop/882459

882459: Change --heal-interval to --attach-int...