Allow inclusion of .config when trying to determine version numbers

* kernel/ruleset/kernel_version.mk (dot-config): Do not set dot-config to 0

* kernel/ruleset/local.mk: Added a diagnostic messages reporting the
  version of kernel-package being run.

* kernel/ruleset/minimal.mk: Ditto

* kernel/ruleset/misc/version_vars.mk: Also track .kernelrelease.

* kernel/ruleset/targets/doc.mk: Added a diagnostic messages reporting the
  version of kernel-package being run.

* kernel/ruleset/targets/headers.mk: Ditto.

* kernel/ruleset/targets/target.mk: Ditto.

* kernel/ruleset/targets/manual.mk: Ditto.

* kernel/ruleset/targets/source.mk: Ditto.

git-archimport-id: srivasta@debian.org--etch/kernel-package--devel--9.0--patch-142