Title: #624: Use connection keep-alive
I examined this in wireshark. Without this patch, `ipa vault-add` would
establish 7 TCP connections to apache, while it establishes only 3 with this
patch. I wasn't able to track down where are the 2 rogue connections opened and
why. The situation is similar for other commands.
The question is whether this improvement is good enough or whether we want to
optimize the RPC to actually use just a single connection.
Also, please follow the development process next time and assign yourself to
the ticket when you start working on it, so other don't have to invest time
into solving the same issue.
See the full comment at
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