Add new --output option.

* Added --output option to store the LC report
* Update the man page accordingly

Change-Id: Iba8ec7c6d65901158ede692f0ba51c07178298d9
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=977863
Signed-off-by: Kiril Nesenko <knesenko@redhat.com>