Expand conf namespace

Put rest of conf.hpp in the conf namespace. This is
largely a sed replace, and wrapping from_json in
conf namespace as it failed to build.

Change-Id: I9fe5c7b2fface44618c43af2367035afc39bcb64
Signed-off-by: James Feist <james.feist@linux.intel.com>
diff --git a/pid/buildjson.hpp b/pid/buildjson.hpp
index 626c982..d4e86a7 100644
--- a/pid/buildjson.hpp
+++ b/pid/buildjson.hpp
@@ -14,5 +14,6 @@
  * @param[in] data - the json data
  * @return the pidConfig, and the zoneConfig
  */
-std::pair<std::map<int64_t, PIDConf>, std::map<int64_t, struct ZoneConfig>>
+std::pair<std::map<int64_t, conf::PIDConf>,
+          std::map<int64_t, struct conf::ZoneConfig>>
     buildPIDsFromJson(const json& data);