Rename C++ fields and internal methods

Summary: From sonar* to flipper*.

Reviewed By: priteshrnandgaonkar

Differential Revision: D9944461

fbshipit-source-id: 870997e3d1d5aaef73dd445e6d94615f93fe6abc

xplat/Flipper/ConnectionContextStore.h

@@ -25,7 +25,7 @@ private:
   DeviceData deviceData_;
 
   std::string absoluteFilePath(const char* filename);
-  bool ensureSonarDirExists();
+  bool ensureFlipperDirExists();
 
 };