Try both rpm and dpks when searching for OS dep
Fix bug: fallback to dpkg/... should work
Fix typo
osdeps: this should work fail if rpm/dpkg say no

If rpm or dpkg is found and they say No, don't try which or locate.
Merge pull request #1111 from wpoely86/osdeps

Try both rpm and dpkg when searching for OS dep
Merge branch 'develop' into stop_triggering_legacy