Few small freebsd fixes (#319)
* Use python 3.7 which is the default.
* Fix typo (missing space before closing ]):
00:04:22.942 + [ -f /usr/ports/UPDATING]
00:04:22.942 [: missing ]
* GC unneded "cd resource". php.sh is included into resources/ngnix.sh, which does
cd resources as the first step by itself.