GlusterFS 3.4.7 consists entirely of bug fixes.

* 076143f protocol: Log ENODATA & ENOATTR at DEBUG in removexattr_cbk

* a0aa6fb build: argp-standalone, conditional build and build with gcc-5

* 35fdb73 api: versioned symbols in libgfapi.so for compatibility

* 8bc612d cluster/dht: set op_errno correctly during migration.

* 8635805 cluster/dht: Fixed double UNWIND in lookup everywhere code