Disable HTTP-level timeouts altogether

[edsko]

Currently we have a workaround in place, but it only works on 64-bit systems. See kazu-yamamoto/http2#112 and kazu-yamamoto/http2-tls#12 .

[edsko]

Marked this as "enhancement" rather than bug because on 64-bit machines this works just fine, and on 32-bit machines things will still work, except that if we have more than 30 minutes between RPC messages, the connection will be broken. Could be argued that this constitutes a bug, however.

[edsko]

One annoying thing is that in the interop tests, when a test fails we might see

Uncaught exception: Thread killed by timeout manager

This can happen if a server is terminated before our worker gets a chance to install its own exception handler. (See #124 for a detailed analysis of these TimeoutThread exceptions.)

[edsko]

Marked as low priority since we don't care about 32-bit machines (for now).