Fix: apistatusd.py

- Changed apistatusd.conf: set server.host default value to 0.0.0.0 to
  improve error messages; needs checking if this disabled ipv6
- Changed apistatusd.conf: renamed default client.cert filename to
  improve meaning

- Fix create_ssl_context: context.options was reset by misuse of `=`
  instead of binary or assignment `|=`
- Changed main/socket-creation: disabled keepalive
- Fix main/connection/pre-ssl-handshake: set missing tls handshake
  timeout; code went into infinite waiting block
- Some cleanup

source/server/apistatusd.conf

@@ -12,14 +12,14 @@ timeout = 5.0
 loglevel = debug
 
 [server]
-host = localhost
+host = 0.0.0.0
 port = 10001
 cert = ./certs/statusd-pub.pem
 key = ./certs/statusd-key.pem
 
 [client]
-cert = ./certs/statusclient-pub.pem
-# possible values: true, false, may
+cert = ./certs/client-ca.pem
+# possible values: false, may, true
 required = true
 
 [api]