Add bpf* to list of device to unhide to fix libnet10
(non functional) Refer to /poudriere for pool handling with MASTERMNT since it will always be there and not per-builder
Blacklist /compat/linux from ldd checks - these do not properly respect LD_TRACE_LOADED_OBJECTS_*
Show log information at end of bulk build
testport -i: Fix stdout being piped to tee(1) breaking terminal usage in the jail
Fix depends failures not failing the build right away
Raise phase length to 15 for 'extract-depends'
Only 'markfs prepkg' ONCE for ref/ and store the mtree.prepkg in MASTERMNT

This avoids extra time in every builder's startup
Add prebuild mtree checking to detect if the filesystme is touched pre-install as portbuild does
Only check prebuild when PORTTESTING
Fix prebuild mtree file not being ignored
Missed a phase format now that it is up to 15
Raise origin format length
When using TMPFS_ALL, still mount ref/poudriere in tmpfs, which allows cp/pax/future -x to not recopy the dir into the builders

pax(1) claims to support multiple -s, which could be used to ignore /poudriere, but it
does not work right, and is prone to breaking if we stop using pax(1) and forget
to ignore /poudriere. By mounting /poudriere in tmpfs always (only in ref), we ensure
that future copying with -x will not copy it.
Make siginfo_handler a little more safe to avoid errors
Don't hide stderr during build_pkg() startup - the actual build's stderr is piped to the log once log_start() is called
Don't hide errors rolling back
When using TMPFS_ALL, still mount an extract tmpfs for LOCALBASE as it is much quicker and reliable for cleanup to just remount it later
Use --fast-read (-q) option of tar when possible
clonefs improvements

- Mount /usr/src readonly and do not clone it in. This is a big improvement
  as the /usr/src tree has up to 48,000 files, and the rest of the tree
  is about 9,000 files.
- Don't clone /poudriere into the builder jails. This also avoids a ton of
  extra file copies that are not needed.
- Ignore /usr/src in mtree files now that it is read-only

Just building 3 ports (2 builders), this spedup the build from 259 seconds to 68 seconds