Remove TestSites::insertIntoDb from Lua test setup helper

It seems not needed, tests pass fine without and with
empty sites table

Having it in the helper causes unintended side-effect of the
contents of my actual sites table being replaced with
test contents. Then, I suppose during actual running of
tests, those are then using the unittest db which would have
no sites.

Change-Id: I289457cef38430e2c9f03efafb5c9b821a47fe5a
Merge "Remove TestSites::insertIntoDb from Lua test setup helper"