release_notes_337

• ports now defaults to using FreeBSD's git repository for checkout when no method is specified.
• zfs rollback: Try harder to rollback snapshots.
• bulk -n: Don't remove .building dir unless this ran made it
• common.sh: use new URL for base system
• jail: Fix git checkout during jail update to operate within SRC_BASE.
• A lot of manpage updates.
• jail: Add support for fetching from artifact.ci.freebsd.org
• ports -m git: Remove default --single-branch.
• ports: Support -D to not shallow clone with git
• ports: Properly detect vcs checkout errors
• ports/jail -m git: Properly check for git being installed
• logclean -N : Fix to keep latest .
• bulk -n: Don't remove .building dir unless this ran made it
• bulk -f: Ignore anything after first column.
• Update cpdup to v1.22 68cb3cb4e14d9c
• ports/jail -m git: Support -U/-v /local/path.
• jail: Allow poudriere -v to override -q for git/svn
• jail -cm git: Allow -v to be excluded to default to remote branch
• misc fixes for pkg-1.17's new PKG_SUFX of .pkg
• Some PORTBUILD_UID/GID fixes and display changes
• ports -c: Disallow using - in new trees as it causes parsing issues
• ALLOW_MAKE_JOBS: Explicitly compare to 'yes'