Merge pull request #2119 from ahmetmircik/backupRemoveOp3

Introduces removeBackup method in backup operations
#1795 Add comment documenting the use of ArrayList
Merge pull request #2108 from Danny-Hazelcast/clientTxnMultiMapTest1

Client txn multi map test when backed by List
get more specific nearCacheConfig fixes ticket 263
fixes #2131
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Fixes #2117 queue.take and queue.poll don't throw interruptedexception
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Removed unwanted system.out
Merge pull request #2109 from eminn/fix/nearcachetests

fix near cache problematic tests.
containsKey operation now checks first client near cache if the value exists in the near cache. fixes #2100
small styling changes related to the tests.
move randomly failing tests to problemic category
change test format
rebase
decrease put count
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