Smoke tests run_all.sh is not robust

[awh]

• In order to determine if all the tests have passed, one must read through the entire log output and check the individual test suites. The script should clearly indicate at the end whether all tests passed, and return an appropriate exit status for use by our CI system
• Some of the shell commands used to check system state can cause the tests to end abruptly due to the use of set -e in config.sh. All failures should be reported through the unit test assert mechanism.

[awh]

There are two issues with the way we're using lehmannro/assert.sh:

• end_suite calls assert_end via whiteley; this uses a sub-shell to capture output, so the overall status var set by assert_end is not visible to the outer script
• Individual test scripts re-source config.sh, which re-sources assert.sh resetting the global test failure status var