bcache-tools: Add command line tool 'bcache'

show the bcache devices in both table-like format and tree-like format.
users can use this tools to manage device(register,unregister,attach,detach,set-cachemode).

Signed-off-by: Shaoxiong Li <dahefanteng@gmail.com>
Signed-off-by: Coly Li <colyli@suse.de>
8 files changed