Consider OPENHAB_* on startup. Closes #408

[heziegl]

if OPENHAB_CONF, OPENHAB_RUNTIME, OPENHAB_USERDATA or OPENHAB_LOGDIR are set upon start their values are now used instead of defaults.

Closes #408

[mention-bot]

@heziegl, thanks for your PR! By analyzing the history of the files in this pull request, we identified @kaikreuzer, @theoweiss and @dvanherbergen to be potential reviewers.

[kaikreuzer]

Thanks. Did you test whether it all still works correctly if you point the different variables to completely different folders?

@BClark09 How do the apt start scripts actually define the folders? Aren't they using the oh2_dir_layout script?

[BClark09]

The apt builds have their own version:

https://github.com/openhab/openhab-linuxpkg/blob/master/resources/deb/bin/oh2_dir_layout

[kaikreuzer]

Ok, thanks - so this shows that it is pretty safe to define custom folders :-)