rtsp: improvement for rtsp connection

- getaddrinfo would return the list of ip addresses from DNS
  server. If the value of calling the function "connect" is
  EINPROGRESS, only the current address would be tried to
  complete connection. Once it fails, the rest addresses
  would never be tried again.

- change the implementation by reconnecting the other ip addresses
  to improve the success rate of rtsp connection.

Crs-Fixed: 742838
Change-Id: Ia867a4cbfc056c61c13e7c4b056d864e2e81204b