TravisCI: Only run tests once.

This modifies the goclean.sh script that is executed on Travis to
only run the tests once.

While it is nice to see coverage reports in the log, unfortunately it
appears that both the -race and -cover flags can't be used together, and
the tests have grown in complexity such that they are starting to get
close to TravisCI time limits.

goclean.sh

@@ -6,7 +6,6 @@
 # 4. gosimple      (https://github.com/dominikh/go-simple)
 # 5. unconvert     (https://github.com/mdempsky/unconvert)
 # 6. race detector (http://blog.golang.org/race-detector)
-# 7. test coverage (http://blog.golang.org/cover)
 #
 # gometalinter (github.com/alecthomas/gometalinter) is used to run each static
 # checker.
@@ -38,26 +37,3 @@ test -z "$(gometalinter -j 4 --disable-all \
 --enable=unconvert \
 --deadline=10m $linter_targets 2>&1 | grep -v 'ALL_CAPS\|OP_' 2>&1 | tee /dev/stderr)"
 env GORACE="halt_on_error=1" go test -race -tags rpctest $linter_targets
-
-# Run test coverage on each subdirectories and merge the coverage profile.
-
-set +x
-echo "mode: count" > profile.cov
-
-# Standard go tooling behavior is to ignore dirs with leading underscores.
-for dir in $(find . -maxdepth 10 -not -path '.' -not -path './.git*' \
-    -not -path './.glide*' -not -path '*/_*' -not -path './cmd*' \
-    -not -path './release*' -not -path './vendor*' -type d)
-do
-if ls $dir/*.go &> /dev/null; then
-  go test -covermode=count -coverprofile=$dir/profile.tmp $dir
-  if [ -f $dir/profile.tmp ]; then
-    cat $dir/profile.tmp | tail -n +2 >> profile.cov
-    rm $dir/profile.tmp
-  fi
-fi
-done
-
-# To submit the test coverage result to coveralls.io,
-# use goveralls (https://github.com/mattn/goveralls)
-# goveralls -coverprofile=profile.cov -service=travis-ci