Only terminate instances created as part of PrivateIPAddressing test.
Test cleanup:

Eutester - remove seconds from time stamp appended to resource names for ELB tests now we have no underscore in ELB name for DNS compatibility.

Eutester4J - New test case to cover setting desired capacity below minimum (new in 4.0), modified tests that set desired capacity to zero by ensuring minimum size is zero first.
Merge pull request #262 from tbeckham/testing

Test cleanup
Merge pull request #260 from kto/fix_private_ip_addressing_test

Only terminate instances created as part of PrivateIPAddressing test.