core: Fix ConfigValues.SSHInactivityTimoutSeconds name

Renames ConfigValues attribute SSHInactivityTimoutSeconds to
SSHInactivityTimeoutSeconds.

Change-Id: I1dcd2ecc787869892eb63a157b4efd0b468113f5
Bug-Url: https://bugzilla.redhat.com/1112036
Signed-off-by: Martin Perina <mperina@redhat.com>