updating containsKey method in PassiveExpiringMap

[thePatmanMI]

correcting the containsKey method to remove all expired entries to match the class and method javadoc statements

[garydgregory]

Please provide a unit test that fails without this patch. Thank you!

[thePatmanMI]

are there additional problems with this change, or can it be merged in?

[kinow]

The change looks OK now I think, with a test. Before being merged, it would require a JIRA ticket as well, to be included in changes.xml.

I had a look at the code in PassiveExpiringMap, and the same removeIfExpired(key, now()) is used in other three methods. The javadocs do not clarify if the key argument is supposed to be used and clear only the expired values with that key, or not.

So for me the options here are to leave as-is and clarify in the Javadoc documentation what is cleared. Otherwise, to modify all methods to match the current javadocs and to expireAll instead.

[garydgregory]

I am waiting for the comments from @kinow to be resolved, by @thePatmanMI or another.