FIX: missing sudo in tests 018 and 019
add check of the host chain after failing over mount
FIX: prophylactically restarting autofs on tests 016-019 (might be screwed up by previous tests)
FIX: exceeded timeouts do not lead to test failure (Time warning instead)
Merge pull request #203 from reneme/fix_http_srv_tests

Polishing for failover test cases

This polishes the failover tests that are already up and running:
    add missing sudo
    timeout checks produce a warning instead of a failure
    working around autofs influences of consecutive tests
    do a host chain check to verify successful failover