net.http.server: Fix #1789 Unregistering the response before sending the trailer of the chunked transfer encoding prevents opportunistic writes from being invoked and running this code again when, which may cause an error when closing the file handle a second time. Normally the file size is known, so no chuck headers are sent.

Merge 0.12->trunk

mod_storage_sql: Fix #1639 Patch by Peter Kieser

net.server_epoll: Remove delay on last main loop iteration when quitting Main difference is that timers are not checked unconditionally before each poll, only when running out of previous poll results (hidden by util.poll). This removes a final poll at shutdown that usually delays the 'not quitting' condition check by one second.

net.server_epoll: Factor out single main loop step into its own function This isn't actually used in Prosody, so no value in complicating the real main loop because of it

Merge 0.12->trunk

configure: Fix quoting of $LUA_SUFFIX (thanks shellcheck/Zash) Transplanted 6b43bf85032b from trunk

Merge 0.12->trunk

mod_storage_sql: Don't avoid initialization under prosodyctl (fix #1787) Fixes `prosodyctl adduser` etc. Prior to d580e6a57cbb the line did nothing. Sometimes storage in the prosodyctl context does cause weirdness, as it is not in a host context, but rather a variant of global.

configure: Fix quoting of $LUA_SUFFIX (thanks shellcheck/Zash)