Resets all taskqueue options to their default values from environment variables.
Details
This function restores options to the values specified in environment variables
(PGHOST, PGPORT, PGUSER, PGPASSWORD, PGDATABASE). Any programmatic changes
made via taskqueue_options are discarded.
Useful after temporarily modifying connection parameters.
Examples
# Override options temporarily
taskqueue_options(host = "test.server.com")
# Reset to environment variable values
taskqueue_reset()