Correct issues identified during testing

[oliver-walker-hms]

• [x] Incorrect request information going out
• [x] Session manage did not resend request for expired token
• [x] Change method name to more descriptive, SessionManger.refreshTokens()
• [x] Ensure thread safety is used with session tokens
• [x] return empty string on no tokens found
• [x] Use config for dataset name instead of serial number

[alexjhawk]

Completed with release of v1.0.0. A new issue should be created for further problems identified.