* Improve the openafs-client init script.

  * Improve the openafs-client init script.
    - Choose the client options based on the cache size by default.
    - Move the code to build the options string to the init script from
      afs.conf so that afs.conf is pure configuration.
    - Improve the readability of the output on start.
    - Significantly improve the comments in afs.conf.
    - Remove the code to set -nosettime as it's now the default.
  * Move the openafs-client init script and afs.conf file we use into the
    debian directory rather than patching the upstream version.  We've
    diverged so much that there's no point in continuing to merge changes.