Revert "Kill unit tests that run more than 1200 seconds"

Revert "Kill unit tests that run more than 1200 seconds"

This reverts commit 3d5c7cd46c60e0a534dce0640c4e47b699e7003e which
added wrapper around all the unit tests that would run the unit test in
the forked process.

This makes any debugging of the unit tests too hard.  Futures attempts
to fix #3980 should add a custom automake test harness (log driver) that
would kill the unit test after configured timeout.