Fix video restarting sync issue

There is a video start/stop sync issue inbetween ikvm server and
ikvm manager because newClient and clientGone callbacks are called
by a different thread from libvncserver. To fix this issue, this
commit moves the video.start() call from server to manager to
unify video control thread.

Tested:
  Open KVM web page and reload the web page by pressing F5.
  KVM page should be reloaded correctly.

Change-Id: Ic0d14ea712510318e9e8f45615a95e82aeaaddf1
Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>
diff --git a/ikvm_manager.cpp b/ikvm_manager.cpp
index 5e014d0..d56110d 100644
--- a/ikvm_manager.cpp
+++ b/ikvm_manager.cpp
@@ -21,6 +21,7 @@
     {
         if (server.wantsFrame())
         {
+            video.start();
             video.getFrame();
             server.sendFrame();
         }