Fix scram.*Client.Step so it returns an "ok" flag consistently #1152
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The package documentation asks to call Step method as while as it returns true, so it has to return false only on the first error or if all expected steps were taken previously. This condition was implemented correctly in the first if-condition where it returned false when there were no more steps or an error was detected. However, the ultimate return statement and the method godoc used to return false as while as the Step should be called again. This commit resolves this inconsistency and updates the relevant godocs. The RFC 5802 example test case is added too.
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The package documentation asks to call Step method as while as it returns true, so it has to return false only on the first error or if all expected steps were taken previously.
This condition was implemented correctly in the first if-condition where it returned false when there were no more steps or an error was detected.
However, the ultimate return statement and the method godoc used to return false as while as the Step should be called again. This commit resolves this inconsistency and updates the relevant godocs.
The RFC 5802 example test case is added too.