changing from PXBDetId/PXFDetId to TrackerTopology in CondTools

Replacement of #5646 based on CMSSW_7_3_X_2014-10-09-1400
@hidaspal 
Translated into this code snippet, please do the following in order to use the RelVal GTs from CondDBv2:
* remove line block 29-34,
* lines 35-36 become:
````
process.load("Configuration.StandardSequences.FrontierConditions_GlobalTag_condDBv2_cff")
from Configuration.AlCa.autoCond_condDBv2 import autoCond
process.GlobalTag.globaltag = autoCond['run2_design']
````