Fix template folder for Debian based distros
Fix template folder for Debian based distros

Debian based distros install files in /usr/local not in
sys.prefix. See [1] for more info.

[1] https://wiki.debian.org/Python#Deviations_from_upstream

Change-Id: I8bd9098f3f529a5ded2b6d2ec8b5081c34590ea8

Frostman/gerrit-dash-creator,Frostman/gerrit-dash-creator,Frostman/gerrit-dash-creator,stackforge/gerrit-dash-creator