fix memory leaks in FastTSGFromPropagation

[wmtan]

While adding the consumes interface in 7_5_X to class FastTSGFromPropagation, I noticed memory leaks due to allocating products at begin run time (function init()) and not always deleting the previous products first. These need to be fixed in 7_4_X
Rather than deciphering the mess and adding deletes where needed, it was much better and safer just to use smart pointers, rather than bare pointers, for the data members owned by this class.
While I was at it, it was much easier and safer also add the consumes interface, so this PR also includes it.
The justifications are:

1. This class already had the consumes interface partially implemented in 7_4_X.
2. This keeps the files similar or identical in 7_4_X and 7_5_X.
3. The fixes for the memory leaks touched many more lines of code than those for the consumes interface.

[cmsbuild]

A new Pull Request was created by @wmtan for CMSSW_7_4_X.

fix memory leaks in FastTSGFromPropagation

It involves the following packages:

FastSimulation/Muons

@ssekmen, @nclopezo, @lveldere, @civanch, @mdhildreth, @cmsbuild can you please review it and eventually sign? Thanks.
@Martin-Grunewald, @matt-komm this is something you requested to watch as well.
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@Degano you are the release manager for this.
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[lveldere]

please test

[cmsbuild]

The tests are being triggered in jenkins.

[cmsbuild]

+1
Tested at: 8c720fe
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-8663/4096/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-8663/4096/summary.html

[lveldere]

+1

thanks a lot Bill!

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_4_X IBs unless changes (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @davidlange6, @Degano, @ktf, @smuzaffar

[davidlange6]

+1