Small changes to tiers support and related test cases.
Changing test suites to use tiers.
[PLINK-187] - Update TOTP tokens without requiring password update
Merge pull request #142 from pedroigor/master

[PLINK-187] - Update TOTP tokens without requiring password update
[PLINK-187] - Update TOTP tokens without requiring password update
Merge remote-tracking branch 'upstream/master'
[PLINK-188] - Support different devices and multiple TOTP tokens
Merge pull request #143 from pedroigor/master

[PLINK-188] - Support different devices and multiple TOTP tokens.