Truncate vagrant ssh warning garbage in run_vagrant_whetstone.
Truncate vagrant ssh warning garbage in run_vagrant_whetstone.

[#97210270]

Signed-off-by: Damon Anderson <93b19e97294520db5d300a69ac27bdbeaec3051d@pivotal.io>

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