Fixes 21.03.2 Mediaserver

Changed:

Reduced the time between requests during index transfer (750ms → 250ms)
When transferring each index, a reload of all indexes and ranges is no longer performed. This reduces the load on the service and reduces the total time for transferring indexes
Upon successful completion of the transfer, a command is sent to reload the indexes
The reload of indexes is done asynchronously

Fixed:

Fix for asynchronous event delivery to the controller
HLS spops for improperly configured cameras
Set TCP connection termination method as RST (SO_LINGER)
Fix for CLOSE_WAIT. Fixed the issue with unstable network when TCP response is not received for session termination
Fix for rtsp url parsing of non-standard ports to improve service stability
SSL self-signed certificate creation of a single instance at server startup
Default parameter tcp-keep-alive is enabled for all streams if parameter stream-keep-alive is not specified in the server configuration file
Invalid PayloadType in RTP packets is ignored in the stream from HikVision camera with temperature sensors
Detection of connection loss (power outage or network failure). Fixed live hang
Connection closure on timeout (appearance of CLOSE-WAIT RTSP connections)
Reset RTSP Read\Write TCP sessions before closing the connection (forcibly reset data in the TCP buffer)
Closing broken https connections (https CLOSE-WAIT)
Replaced locking type shared_mutex → mutex
DVR write, fixed the problem of missing headers in records
Fixed stream transfer between nodes to improve service stability
Fixed DVR for Axis cameras to improve service stability
Fixed disabling of DVR via API request to improve service stability
Other fixes that improve service stability