Cherry-pick of MR !396 to master branch
Added fallback for VELO tracks' cov matrix in DTF (2018-patches)
See merge request !396 (merged)
(cherry picked from commit 1877b08c)
5dd2d459 Added fallback for VELO tracks' cov matrix in DTF (2018-patches) 425e1b37 Moved init of m_maxCovVeloTrack to header.