SSL sockets may leak when keepalive is enabled #5699

issue is in: lib/_http_agent.js
The issue is reproducible whenever the ca property is set globally in the agent and an https request is made with https.request(ops) where ops does not have the property ca

_http_agent.js @ Agent.prototype.createSocket
the options are extended with the global options object which contains ca. In getName ca is used in the name generation of the hash.

however _http_agent.js @ Agent.prototype.addRequest
The options (passed from the call https.request(ops) which don't have the property ca) are used to get a hashtag which is now different. The socket leaks and is closed when the timeout hits. Meanwhile a new socket is created for the request.