added timeout to stackwalker invocation
adjusted for longer timeout
fixes bug 929204 - Remove all obsolete crontabber code related to storing the state in a json file
Merge pull request #1936 from rhelmer/no-bug-fix-migration

(no bug) fix migration downrev
Merge pull request #1901 from twobraids/log-kill-by-timeout

Fixes Bug 972857 - added timeout to stackwalker invocation
Merge branch 'bug-929204-remove-all-obsolete-crontabber-code-related-to-storing-the-state-in-a-json-file'
Merge branch 'master' of github.com:mozilla/socorro
fix bug 928051 - correct error in migration script