Apply clang-format for more source files (#795)

Apply clang-format for C source files in folder core/app-mgr,
core/app-framework, and test-tools.
And rename folder component_test to component-test, update
zephyr build document.

Signed-off-by: Wenyong Huang <wenyong.huang@intel.com>

core/app-framework/connection/native/zephyr/connection_lib_impl.c

@@ -12,12 +12,14 @@
 
 #include "connection_lib.h"
 
+/* clang-format off */
 /*
  * Platform implementation of connection library
  */
 connection_interface_t connection_impl = {
-        ._open = NULL,
-        ._close = NULL,
-        ._send = NULL,
-        ._config = NULL
+    ._open = NULL,
+    ._close = NULL,
+    ._send = NULL,
+    ._config = NULL
 };
+/* clang-format on */