Give users the ability to disable package reporting

This is done via a new setting in the rhsm.conf file. If the setting

report_package_profile = 1

is changed to zero then the package profile will not be sent up.
This setting has no impact if the backend service does not suppot
package uploads.
Merge pull request #487 from candlepin/bkearney/pkg_reporting

Give users the ability to disable package reporting