Changes

Build junitreport with hack/build-go.sh, based on
tools/junitreport/README.md.
Addressing
$ make test hack/test-tools.sh FAILURE after 0.050s:
hack/test-tools.sh:9: executing 'tools/junitreport/test/integration.sh'
expecting success: the command returned the wrong error code Standard
output from the command:
[INFO] Building junitreport binary for testing...
Standard error from the command: junitreport.go:10:2: cannot find
package "github.com/openshift/origin/tools/junitreport/pkg/cmd" in any
of:
      
/usr/lib/golang/src/github.com/openshift/origin/tools/junitreport/pkg/cmd
(from $GOROOT)
       ($GOPATH not set)
[ERROR] PID 28008: hack/lib/cmd.sh:241: `return "${return_code}"` exited
with status 1.
[INFO]          Stack Trace:
[INFO]            1: hack/lib/cmd.sh:241: `return "${return_code}"`
[INFO]            2: hack/test-tools.sh:9: os::cmd::expect_success
[INFO]   Exiting with code 1. Makefile:198: recipe for target
'test-tools' failed make: *** [test-tools] Error 1
 (commit: bffdfba)