Modify command in initializing unit tests

This cleans up the current script we have to a simple one-liner to test
unit tests.

script/test-unit

@@ -3,24 +3,4 @@ set -e
 
 source "$(dirname "$BASH_SOURCE")/.build"
 
-find_dirs() {
+go test "${BUILD_FLAGS[@]}" -race -cover -v $( go list github.com/kubernetes-incubator/kompose/... | grep -v '/vendor/' )
-  (
-    find . -not \( \
-        \( \
-          -path './vendor/*' \
-        \) -prune \
-      \) -name '*_test.go' -print0 | xargs -0n1 dirname | sed 's|^\./||' | sort -u
-  )
-}
-
-TEST_FLAGS=("${BUILD_FLAGS[@]}" -cover -coverprofile=cover.out)
-
-if [ -z "$TEST_DIRS" ]; then
-  TEST_DIRS=$(find_dirs '*_test.go')
-fi
-
-TESTS_FAILED=()
-
-for dir in $TEST_DIRS; do
-  go test "${TEST_FLAGS[@]}" "./${dir}"
-done