Merge changes from the 2.6.0 release.
Add a test case on the getHeadPID method to test the messing time stamps.
Add a junit test to test using the noaa format id to validate a xml object.
1. Set knb to version 2.2. Centralize the lter tests into one class.
The getPackage method should throw an exception since the id is a data object.
Add a junit test.
'Change the verion of the production CN from the v1 to the v2.
Add two new test methods to test systemMetadataPIDExists and systemMetadataSIDExists.
merge from 2.0 branch: use updated node list information from cn-dev so that test will match current state of env. https://redmine.dataone.org/issues/7534
merge from 2.0 branch: initialize mock cn for test to run successfully.
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