v2.1.15.RELEASE

Change log:

445bd27 Fix addressResolver afte merge conflict
8d72e57 Make test method public for JUnit 4
127281b Fix typo in the test
1c4fc55 Fix test for JUnit 4
8e615d0 GH-1198: Support AddressResolver
2496b53 GH-1157: Defer spy stubs to original bean
fefb1f2 GH-1194: Address new Sonar issues
4a3c427 Fix test to use setPublisherConfirms(true)
404d53b GH-1194: Fix cache limit with Pub Confirms channel