Benchmarks: user get_target_property instead of get_property to make it work with cmake 2.4.
Qfs client: read rpc response skip disk checksum verify flag to true only if the original request had it set to true, that potentially bogus value in the response will not result in the endless retry loop and can possibly be detected by causing the checksum verification failure.
Chunk server: optimize replication checksum: use new skip disk checksum verify mode for reads by default if the read request position starts at the checksum block boundary (this should be always true with replication); only retry read with disk checksum verify mode on if the checksum verification fails; use computed checksums for read verification with chunk write. The optimization should reduce 3 checksum computation in the replication path with only one under the normal circumstances.