The lintian files were being written for every format, whether they were
a deb or not.
Since package name and arches are the same, and packaging runs in
parallel, it could happen that one goroutine is reading while the other
is writing, as we were guaranteeing uniquenes based on package name and
arch only.
This makes it only creates the lintian files when format is deb, so this
shouldn't happen anymore.
It also goes one step further by using the actual format in the filepath
instead of hard-coding "deb".
This also still supports tmux.
closes#4024
b9e276feca