core: Fix ConfigValues.SSHInactivityHardTimoutSeconds name

Renames ConfigValues attribute SSHInactivityHardTimoutSeconds to
SSHInactivityHardTimeoutSeconds.

Change-Id: I73054c79d5c69fe188f2b3f6a5f9f936f5298ba9
Bug-Url: https://bugzilla.redhat.com/1112036
Signed-off-by: Martin Perina <mperina@redhat.com>