Remove trailing slash on file copy during construct_ltc_gopath.
Remove trailing slash on file copy during construct_ltc_gopath.

  + Hopefully, this lets the pipeline update the diego-release Godeps in ltc.

[#87262154]

felipeg48/lattice,Klaudit/lattice,svrc-pivotal/lattice,datachand/lattice,SrinivasChilveri/lattice,SrinivasChilveri/lattice,mikegehard/lattice,davidwadden/lattice-release,datachand/lattice,davidwadden/lattice,cloudfoundry-incubator/ltc,datachand/lattice,svrc-pivotal/lattice,davidwadden/lattice,cloudfoundry-incubator/ltc,mikegehard/lattice,datachand/lattice,SrinivasChilveri/lattice,davidwadden/lattice-release,Klaudit/lattice,svrc-pivotal/lattice,Klaudit/lattice,felipeg48/lattice,SrinivasChilveri/lattice,svrc-pivotal/lattice,Klaudit/lattice