debian: speedup 'make deb'

Use 'timesize' instead of md5 will speed up the packaging a lot.
Alsl add --parallel for dh_auto_build so that we can specify
DEB_BUILD_OPTIONS=parallel=number to parallelize buliding as following:

$ DEB_BUILD_OPTIONS=parallel=8 make deb

Signed-off-by: Liu Yuan <namei.unix@gmail.com>
sheepfs: fix sdhost

"localshot" isn't recognized anymore by dog. We have to specify numeric letters.

Signed-off-by: Liu Yuan <namei.unix@gmail.com>