Add missing constant

[ianna]

• Add missing constant

[ianna]

@dildick - the rest of it is already merged in 70x IB.

[ktf]

@ianna @dildick, can you please integrate the test in scram b runtest? Reading the geometry and exit with 0 is probably enough (i.e. no printouts).

[nclopezo]

A new Pull Request was created by @ianna for CMSSW_7_0_X.

Add missing constant

It involves the following packages:

Geometry/MuonCommonData

@civanch, @Dr15Jones, @ianna, @mdhildreth, @cmsbuild, @nclopezo, @Degano, @ktf can you please review it and eventually sign? Thanks.
@ghellwig this is something you requested to watch as well.
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@nclopezo, @ktf you are the release manager for this.
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