Don't allow double compression.

Support compression also after SASL.

Merge with waqas

mod_compression: Fixed some undefined global accesses

net.adns: Add some debug logging to help track down traceback

net.server: Add checking for nil sockets to prevent traceback

net.dns: Automatically add nameserver 127.0.0.1 if /etc/resolv.conf missing or empty on a non-Windows system (thanks Louis Mamakos)

Merge waqas with Tobias. Eww.

Removed util/discohelper.lua

Removed core/discomanager.lua

modulemanager: Removed unused variables and reference to core.discomanager

modulemanager: Removed unnecessary code in the unload function

modulemanager: Removed legacy disco#items hook

modulemanager: add_feature and add_identity APIs updated to use only the add_item API

componentmanager: Removed disco#items hook, and reference to core.discomanager

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