[snmp|agent|test] Test case info and cleanup

1) A test case failed due to the times retreived by
   get(snmpEngineTime) reported to large time diffs
   (this is basically a sanity check).
   Added some more info about time(s) to see if there
   are some "gaps" somewhere.
   The problem occurred on a slow Virtial Machine.

2) A previous (failing) test case failed to cleanup after
   itself (see above), which caused later test cases to fail.
   Specifically, the app top supervisor was not terminated,
   which caused the start agent function to fail (basically
   already_started).

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