pulsesink does not recover from the pulseaudio server dying

Submitted by jam..@..il.com

Link to original bug (#740385)

Description

Steps to reproduce:

1. Start playback of an mp3 on a platform that uses pulsesink by default:
   GST_DEBUG=*:3 gst-launch-1.0 playbin uri=file:///music/my.mp3 audio-sink='pulsesink'
2. kill -9 pidof pulseaudio
3. Notice that playback stops and the following errors are observed:

0:00:40.970599079 20926 0xb1c2df80 WARN pulse pulsesink.c:1752:gst_pulseringbuffer_commit:<audio-sink> error: pa_stream_writable_size() failed: Connection terminated
0:00:41.311085079 20926 0x64f9a0 WARN pulse pulsesink.c:413:gst_pulsering_is_dead:<audio-sink> error: Disconnected: Connection terminated

Expected results:

1. pulsesink tries to reconnect to the pulse server and recreate the pa_context.

Version: 1.4.4