The commit 0436af5 breaks startup for jsonrpcs module.

Logs:

Jul  5 10:04:41 kam01 kamailio[4951]: ERROR: jsonrpcs [jsonrpcs_sock.c:358]: jsonrpc_dgram_init_server(): failed to change the owner/group for /var/run/kamailio/kamailio_rpc.sock  to 33.0;Operation not permitted[1]
Jul  5 10:04:41 kam01 kamailio[4951]: CRITICAL: jsonrpcs [jsonrpcs_sock.c:423]: jsonrpc_dgram_init_socks(): initializing datagram server function returned error
Jul  5 10:04:41 kam01 kamailio[4951]: ERROR: jsonrpcs [jsonrpcs_sock.c:246]: jsonrpc_dgram_mod_init(): init datagram sockets function failed
Jul  5 10:04:41 kam01 kamailio[4951]: ERROR: jsonrpcs [jsonrpcs_mod.c:1150]: mod_init(): cannot initialize datagram transport
Jul  5 10:04:41 kam01 kamailio[4951]: ERROR: <core> [core/sr_module.c:849]: init_mod(): Error while initializing module jsonrpcs (/usr/lib/x86_64-linux-gnu/kamailio/modules/jsonrpcs.so)

Relevant cfg:

loadmodule "jsonrpcs.so"
modparam("jsonrpcs", "pretty_format", 1)
modparam("jsonrpcs", "dgram_user", "www-data")
modparam("jsonrpcs", "dgram_group", "root")
modparam("jsonrpcs", "transport", 7)

Previously Kamailio was started as root, and then configured with -u $USER and -g $GROUP to drop privileges to the lower user/group. During startup Kamailio could create the socket with the correct permissions.
The mentioned commit changes this to: start Kamailio directly as user Kamailio and group Kamailio, which don't have privileges create the sockets with the correct permissions.

Not sure about the motivation about this change, so I don't want to simple revert it. Maybe @sergey-safarov or other developers can comment.

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