hs-test: added dry run mode

- DRYRUN=true will set up most containers. Some need to be started
  manually (curl, nginx...). The framework will create a vpp-config
  file with interface configs that will get executed on VPP startup.
- set Ginkgo to use -v instead of -vv when running a single test
- s.Log() now supports formatting
- added 'useEnvVars' parameter to container.Exec

Type: test

Change-Id: Id1da7947a1448ee4b74b86cc4f243442256a5ba8
Signed-off-by: Adrian Villin <avillin@cisco.com>

extras/hs-test/infra/utils.go

@@ -270,7 +270,7 @@ func (s *HstSuite) StartServerApp(c *Container, processName string, cmd string,
 	running chan error, done chan struct{}) {
 
 	s.Log("starting server")
-	c.ExecServer(cmd)
+	c.ExecServer(true, cmd)
 	cmd2 := exec.Command("docker", "exec", c.Name, "pidof", processName)
 	err := cmd2.Run()
 	if err != nil {