fix HOME env

[anikaweinmann]

The HOME environment variable was set to /tmp/:/root to fix this the env attributes are now subdivided into:

1. variables where use self.env and enviroment variable values (used for ["PATH", "PYTHONPATH"])
2. use self.env value for the rest (HOME is before set to $HOME if $HOME is set)

resulting in:

GISBASE=/usr/local/grass
GISRC=/tmp/tmplc_46gr7/gisrc
LD_LIBRARY_PATH=/usr/local/grass/lib
GRASS_ADDON_PATH=/root/.grass8/addons/
GRASS_VERSION=7.7.svn
PYTHONPATH=:/usr/local/grass/etc/python
GRASS_MESSAGE_FORMAT=plain
GRASS_SKIP_MAPSET_OWNER_CHECK=1
GRASS_TGIS_RAISE_ON_ERROR=1
GIS_LOCK=48
HOME=/root
GRASS_ADDON_BASE=/root/.grass8/addons/
PATH=/usr/local/grass/bin:/usr/local/grass/scripts:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

[mmacata]

Interesting. I still wonder why it worked for the webserver and not for the worker.