A few fixes for Tracking stuffs: do not delete at endRun what is created in the constructor

In the modifications meant to port to multi-threaded fwk a few tracking related classes in PR #1628 (later become #1634) the creation of some objects was moved from begin run to the class constructor.
I verified that there were a few cases in which those objects were still destructed at the endRun, thus resulting in a series of segmentation violations reported, e.g., by the first three workflows in https://cmssdt.cern.ch/SDT/cgi-bin//showMatrixTestLogs.py/slc6_amd64_gcc481/www/sat/7.0-sat-02/CMSSW_7_0_X_2013-12-07-0200/pyRelValMatrixLogs/run/
This Pull Request fixes those cases. The wkfs 4.34, 4.6 and 144.6, as well as all those in the short matrix run now without crashing
Please Reco guys: check that what is in this PR still satisfy your wishes (and sign it if so)