Remove isLocal and use location()

[jpavel]

Fix requested by @davidlange6 at #3059.

[jpavel]

@monicava, this is something you wanted to watch

[cmsbuild]

A new Pull Request was created by @jpavel (Pavel Jez) for CMSSW_6_2_X_SLHC.

Remove isLocal and use location()

It involves the following packages:

RecoTauTag/RecoTau

@nclopezo, @cmsbuild, @anton-a, @thspeer, @slava77, @Degano can you please review it and eventually sign? Thanks.
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@andersonjacob, @mark-grimes you are the release manager for this.
You can merge this pull request by typing 'merge' in the first line of your comment.

[mark-grimes]

merge

Tested by removing wpDiscriminationAgainstElectronMVA5.root from the checked out package in $CMSSW_BASE so that it has to look for the one in $CMSSW_RELEASE_BASE. First verified that step 3 crashes, then applied the patch.
Fixes these tests which failed step 3 in the Integration Build: 10000, 10200, 10400, 11200, 11400, 11600, 11800, 12000. Tried other tests but ran of disk quota.