ARROW-4996: [Plasma] Enable uninstalling of signal handler and fix log_dir#4013

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guoyuhong wants to merge 5 commits intoapache:masterfrom

ant-tech-alliance:fixLog

Commits on Mar 26, 2019

Enable uninstall of signal handler and fix log_dir
Yuhong Guo
committed
Move app_name_ to function static variable.
Yuhong Guo
committed
Move log_dir_ to logging.cc
Yuhong Guo
committed
Address comments
Yuhong Guo
committed
Move UninstallSignalAction to store.cc
Yuhong Guo
committed