bdgfn: a fix for free() of unused bdgreq
Merge pull request #1 from hwanju/my_test

bdgfn: a fix for free() of unused bdgreq
Makefile: misc fix for changing across directories in get-drivers

For dash, it's fine to return back to OLDPWD out of scope, but for bash,
OLDPWD seems to be lost outside parenthesis.
Merge pull request #2 from hwanju/my_test

Makefile: misc fix for changing across directories in get-drivers
freebsd: Added netback netmap initial scaffold.
freebsd: netback: align netmap rings with xen
freebsd: netback: Implemented nm_txsync/rxsync

Currently performs at 580 Kpps (being limited by grant copy)
freebsd: netback: Move gnttab setters into nm_*sync