git-arc: Cope with extra output

[imp]

Summary

On my machine, for reasons beyond my understanding, I get this warning
two times when running arc:

Warning: Module "openssl" is already loaded in Unknown on line 0

so grep -v ^Warning: on all the arc call-conduit calls to filter them
out so we can properly parse the JSON with jq.

Sponsored by: Netflix

Test Plan

This, and the prior review, gets me to a working git arc again.

[markj]

Same comment as the other review: can we handle this in a subroutine?

[imp]

do the filtering routine that markj wanted

[markj]

tools/tools/git/git-arc.sh

153

Why "$*" and not "$@"?

[imp]

tools/tools/git/git-arc.sh

153

Old habits die hard... the Solaris shell had issues with that... or maybe it was sunos... but v7 she'll it works... I'll update

[jhb]

Ditto on "$@". :)

[imp]

use "$@" since that expands to something we want, unlike $* which doesn't
(see the manual for the subtle differences)