Allow creating jails from a pojects branch, like projects/clang350-import
Merge remote-tracking branch 'origin/pr/244'

* origin/pr/244:
  XDEV: Setup env with MACHINE/MACHINE_ARCH based on the -a arguments to make bmake realize that its cross building.  Tested on builds of math/fftw3
  XDEV: Don't replace /sbin/sysctl as we need to emulate it to catch sysctl's and translate/override them in our emulator.
  XDEV: Remove path munging as the nxb-bin native-xtools toolchain does not link correctly in a lot of cases.
  XDEV: Add WITH_DEBUG=y for any mips64 build.  Strip is broken for this arch and hasn't been fixed in head/release.
/usr/lib/crt1.o is unsafe to use on FreeBSD 8 so for now only use it when using emulation
Use the new process reaper when possible to kill children instead of killpg
Test for PROC_REAP_KILL instead of PROC_REAP_ACQUIRE

to avoid having this code working on dfly for now
Remove unused variable
testport: Show error when unable to extract pkg

Issue:	#256
jail -uc: Support a SETNAME-src.conf
Merge remote-tracking branch 'upstream/master'
Python checks to see how many cpus it is allowed to use and bypasses what poudriere allows for the build.  This causes emulation failures and failed builds/deadlocks.