Remove HTTP/2 support. I don't believe this is useful for the few outgoing requests we make. The h2 crate has seen only a couple of advisories from what I remember, but it is also ~18K SLOC talking to untrusted hosts, that doesn't bring us significant benefit.
Vendored the sd_notify bits we use. This also fixes the STOPPING notification, which I believe never worked. (The env var was unset by the READY notification.)
Replaced the matches crate with std::matches.
Removed our usage of lazy_static. Still used by dependencies.
This removes some dependencies:
h2crate has seen only a couple of advisories from what I remember, but it is also ~18K SLOC talking to untrusted hosts, that doesn't bring us significant benefit.sd_notifybits we use. This also fixes theSTOPPINGnotification, which I believe never worked. (The env var was unset by theREADYnotification.)matchescrate withstd::matches.lazy_static. Still used by dependencies.