Update Debian packaging to 1.5.77-2 release

Update Debian packaging to 1.5.77-2 release

Contains DKMS robustness fixes, improvements to the defaults for the
module build, and cleanup of the openafs-client init script.  Updates
the build system for the new demand-attach binary naming and for the
changes to supported configure options.  Fixes some issues with
afs-newcell.  Forces disabling of the Linux syscall probing in kernel
module builds, since no supported Debian kernel allows this and it
causes problems.  Update debhelper to V8, which allows simplification
of debian/rules and debian/module/rules.

Reviewed-on: http://gerrit.openafs.org/2849
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 7d272f05059a4b467ee41a2a0d8781e9f9c4c250)
Change-Id: Ic0468c79db043651889b2a9b2e18b0246acf7c71
Reviewed-on: http://gerrit.openafs.org/2924