Fixed a bug in health_check_tests.cpp.
Fixed a bug in health_check_tests.cpp.

We forgot to call MesosTest::SetUp() and MesosTest::TearDown() in the
override methods.

Review: https://reviews.apache.org/r/69713

Gilbert88/mesos,dforsyth/mesos,abudnik/mesos,jpeach/mesos,reneploetz/mesos,Gilbert88/mesos,kaysoky/mesos,Gilbert88/mesos,dforsyth/mesos,abudnik/mesos,kaysoky/mesos,kaysoky/mesos,dforsyth/mesos,gsantovena/mesos,gsantovena/mesos,dforsyth/mesos,reneploetz/mesos,jpeach/mesos,jpeach/mesos,jpeach/mesos,chhsia0/mesos,jpeach/mesos,reneploetz/mesos,abudnik/mesos,kaysoky/mesos,reneploetz/mesos,reneploetz/mesos,chhsia0/mesos,dforsyth/mesos,chhsia0/mesos,gsantovena/mesos,reneploetz/mesos,abudnik/mesos,abudnik/mesos,chhsia0/mesos,Gilbert88/mesos,jpeach/mesos,gsantovena/mesos,reneploetz/mesos,chhsia0/mesos,chhsia0/mesos,kaysoky/mesos,gsantovena/mesos,kaysoky/mesos,dforsyth/mesos,dforsyth/mesos,gsantovena/mesos,chhsia0/mesos,Gilbert88/mesos,Gilbert88/mesos,abudnik/mesos,Gilbert88/mesos,abudnik/mesos,jpeach/mesos,gsantovena/mesos,kaysoky/mesos