mod_invites_adhoc: Fall back to generic allow_user_invites for role-less users Fixes #1752

Merge 0.12->trunk

mod_cron: Fix recording last task run time #1751 The type checks, they do nothing! Observed: Tasks that were supposed to run weekly or daily were running each hour.

util.prosodyctl.check: turn: Report lack of TURN services as a problem #1749 Rationale: It seems unlikely that someone who has not configured any TURN service runs 'prosodyctl check turn' expecting this to be okay.

net.server_select: Restore dependency on LuaSec to soft for tests server_select is used in e.g. storagemanager tests, and some of the CI runners are lacking LuaSec, which resulted in failures.

net.tls_luasec: Harden dependency on LuaSec We at some point decided that it was okay to have a hard dependency the TLS library. Especially here since this module is meant to contain all LuaSec specifics.

Merge 0.12->trunk

mod_tls: pass target hostname to starttls In case the network backend needs it for outgoing SNI or something.

mod_tls: tell network backend to stop reading while preparing TLS

mod_tls: Do not offer TLS if the connection is considered secure This may be necessary if the session.conn object is not exchanged by the network backend when establishing TLS. In that case, the starttls method will always exist and thus that is not a good indicator for offering TLS. However, the secure bit already tells us that TLS has been established or is not to be established on the connection, so we use that instead.