clang-tidy: cppcoreguidelines-special-member-functions

clang-tidy: cppcoreguidelines-special-member-functions

clang-tidy reports an infringement of
cppcoreguidelines-special-member-functions[1] for
_scoped_rcu_read_lock, iterator, session_not_found_error,
and session_not_found_error.

The copy constructor, move constructor, and assignment operators
are deleted when they are not explicitly defined.

[1] https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#c21-if-you-define-or-delete-any-copy-move-or-destructor-function-define-or-delete-them-all

Change-Id: I1ec5470fed8ddf30025d7c71994bff9bafcfbf56
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>