[cdc_rsync] [cdc_stream] Remove SSH port argument (#41)

This CL removes the port arguments for both tools.

The port argument can also be specified via the ssh-command and
scp-command flags. In fact, if a port is specified by both port flags
and ssh/scp commands, they interfere with each other. For ssh, the one
specified in ssh-command wins. For scp, the one specified in
scp-command wins. To fix this, one would have to parse scp-command and
remove the port arg there. Or we could just remove the ssh-port arg.
This is what this CL does. Note that if you need a custom port, it's
very likely that you also have to define custom ssh and scp commands.

common/port_manager_test.cc

@@ -49,14 +49,14 @@ constexpr char kRemoteNetstatOutFmt[] =
 class PortManagerTest : public ::testing::Test {
  public:
   PortManagerTest()
-      : remote_util_(/*verbosity=*/0, /*quiet=*/false, &process_factory_,
+      : remote_util_(kUserHost, /*verbosity=*/0, /*quiet=*/false,
+                     &process_factory_,
                      /*forward_output_to_log=*/true),
         port_manager_(kGuid, kFirstPort, kLastPort, &process_factory_,
                       &remote_util_, &system_clock_, &steady_clock_) {}
 
   void SetUp() override {
     Log::Initialize(std::make_unique<ConsoleLog>(LogLevel::kInfo));
-    remote_util_.SetUserHostAndPort(kUserHost, kSshPort);
   }
 
   void TearDown() override { Log::Shutdown(); }