build: some small improvements; bump to go1.10

- bump to go 1.10
- Add a linker tag with the build version
- Remove fastbuild, go builds are cached now
- Use better ginkgo suite names

plugins/meta/portmap/portmap_suite_test.go

@@ -37,7 +37,7 @@ func TestPortmap(t *testing.T) {
 	rand.Seed(config.GinkgoConfig.RandomSeed)
 
 	RegisterFailHandler(Fail)
-	RunSpecs(t, "portmap Suite")
+	RunSpecs(t, "plugins/meta/portmap")
 }
 
 var echoServerBinaryPath string