plasma_store process should cleanup on INT and TERM signals

[asfimport]

Currently, if you send an INT and TERM signal to a parent plasma store process (Python one) it terminates it without cleaning the child process. This makes it hard to run plasma store in non-interactive mode. Inside shell ctrl-c kills both processes.

Moreover, INT prints out an ugly KeyboardInterrup exception. Probably something nicer should be done.

Reporter: Mitar / @mitar
Assignee: Mitar / @mitar

PRs and other links:

• GitHub Pull Request #1705

_{Note: This issue was originally created as ARROW-2250. Please see the migration documentation for further details.}

[asfimport]

Mitar / @mitar:
I made this pull request: #1705

[asfimport]

Mitar / @mitar:
I made an observation that parent process is unnecessary and made pull request which just replaces it with plasma store executable. In this way then all future signal are handled by the process through that executable.

This makes everything cleaner and means that it is not needed to do any signal passing or cleanup.

[asfimport]

Wes McKinney / @wesm:
Issue resolved by pull request 1705
#1705