ci: add clang regression tests
ci: make --enable-debug a job parameter rather than a separate builder
ci: hoist job template parameters to defaults
Documentation: Improve HostDB section.
Add :metric: keyword to :ts:cv:
Fix broken link in logging section.
Documentation: Add ip_resolve option description.
parallelize the SSL certificate creation script
doc: document proxy.config.ssl.server.multicert.filename
Fix error log message in HttpTransact::build_error_response
ci: add debian hardening builds
TS-2136: Fix the first proxy.config.http.accept_no_activity_timeout is invalid.
ci: update redhat package list
ci: more robust autoreconf detection
Remove global number_of_processors variable
remove global variable dependencies from adjust_num_of_net_threads()
Updated the precedence list, thanks dcarlin, and added map-all
Doc: Fix storage.config write up about raw devices and permissions.
ci: fix 3.2.x git branch mapping
TS-2143 Remove alarm email address support (and config).

This removes proxy.config.admin.admin_user, which was used for
other things in the past, but now only for an email address
passed to the alarm script.

The alarm scripts now only get two arguments (and always 2):

    A description of the alarm
    A number identifying the alarm (e.g. "14")

In addition, this script cleans up some old code that was
customized for an old Inktomi customer. This is obviously
no longer something we need, or should support.

The "Upgrade to v4.0.0" Wiki will be updated with these details.
Added TS-2143
TS-287: transaction_active_timeout_in does not trigger on the first request of a Keep-Alive connection.

The bug is fixxed by Li Gang(quehan@taobao.com)