Convert cbc(1) and cbcrc(4) manpages to asciidoc

Change-Id: Ic5ab411ffdfe4163123c27fe09f2bb39176776c7
Reviewed-on: http://review.couchbase.org/27843
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>