The 26compat release series has reached end-of-life.

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Exported symbols of LogDomain, LogSeverity and MessageEventEphemeral
classes in order for the apps to be able to intercept mongo client's logs

Cherry pick of server commit db59c175c736609970b52f91e30fc2277e22b25b

On the 26compat branch, we trust upstream (server) to provide
correctly curated error codes.

(cherry picked from commit c05e8ff7)

Older boost doesn't include make_shared.hpp in smart_ptr.hpp, so the
include of smart_ptr.hpp in pch.h doesn't make make_shared.hpp available
in the replica_set_monitor files.

(cherry picked from commit 5bf477aa)

Conflicts:
	SConstruct
	src/mongo/util/time_support.cpp

(cherry picked from commit 9f28c088)

These files changed significantly between rc2 and rc3, including
pulling in a new dependency on db/client.h, which we had not extracted.

We def. don't want db/client.h and its transitive dependencies, but
as a nice consequence of other edits in rc2..rc3, no files that we
own now depend on signal_handlers.h, so we can drop the dependency,
rather than needing to pull in db/client.h

Note that we have already made this change on the legacy branch. The
driver library shouldn't be in the business of signal handling.

CXX-126 Backport relevant server repo changes applied between rc1 and rc2