Ensure no redundant rcl_logging initialization and finalization.#560

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fujitatomoya wants to merge 5 commits intoros2:masterfrom

fujitatomoya:topic-20200123-avoid-redundant-log-init

Commits on Jan 23, 2020

Commits on Jan 24, 2020

use atomic counter for rcl logging init/fini.
fujitatomoya
committed

Commits on Jan 28, 2020

reconsider atomic counter with expectation logging init/fini always succeed.
fujitatomoya
committed

Commits on Feb 3, 2020

get rid of unnecessary difference and change name for global variable.
fujitatomoya
committed