Add /lib64/pkgconfig in PKG_CONFIG_PATH to support centos6.6

Change-Id: I7af048213211a257482134753ad765e127f9d4b1
Several fixes

JSON fixed for service_info.
Finer decache in resolver.

Change-Id: Ib145ba973ad7d9f3810c4c0fa4f30f1be1ff4639