Enable connection pooling for the remote REST cache

Connection pooling is a useful optimization for REST caches that are
far away as it avoids constantly redoing the TCP handshake. It also
prevents large builds from exhausting the local interface's source
ports through tens of thousands of one-transaction connections.

The default connection pool size of 20 is fairly arbitrary. Users
probably want to set this to something close to the value of --jobs.

We introduce some generic infrastructure for closing remote cache
instances and use it to cleanly shutdown the connection pool between
builds.

Change-Id: I73adc29ecae15cc10a1217ffbaa483892bcd4f9a
PiperOrigin-RevId: 160264681

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