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.

Change-Id: I4db4df873607129548557389f08c7ec1480e7204
Reviewed-on: http://gerrit.openafs.org/2849
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>