Increasing thrift's ServerConnectivityCheckInterval from 5ms to 100ms

[seejdev]

This changes the Thrift server-side connectivity checks to be 20 times less frequent.

From Thrift documentation:

ServerConnectivityCheckInterval defines the ticker interval used by
connectivity check in thrift compiled TProcessorFunc implementations.

So we have two-way connectivity checks occurring where:

• Every 5 seconds, launcher osquery client is pinging the osquery Thrift server to check that the osquery process is still running.
• Every 5 milliseconds, the osquery Thirft server is checking that the socket connected to the client is still open.

Increasing the latency to 100ms seems reasonable.

[directionless]

Let's try! I don't love the globals, but here we are.