Adding cell creation support to afsio

Currently, OpenAFS provides the afsio command that supports read, writes, and locks to both files and directories in the AFS environment without going through the cache manager. However, it does not support mount point control, ACL manipulation, or directory operations, which would allow a fully functional cell to be created without the cache manager; This would be convenient for administrators, as it avoids the kernel module having to be installed on the machine setup is being performed from, as well as allowing setup in environments not compatible with the kernel module. To address this problem, I will implement all three types of subcommands of afsio; Key deliverables include the code for all of these types of commands, as well as documentation such that administrators know how to use them.