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>

test-tools/component-test/README.md

@@ -0,0 +1,56 @@
+# Component Test
+
+The purpose of this test suite is to verify the basic components of WAMR work well in combination. It is highly recommended to run pass all suites before each commitment.
+
+Prerequisites
+==============
+- clang is available to build wasm application.
+- python is installed to run test script.
+
+
+Run the test
+=============
+```
+start.py [-h] [-s SUITE_ID [SUITE_ID ...]] [-t CASE_ID [CASE_ID ...]]
+              [-n REPEAT_TIME] [--shuffle_all]
+              [--cases_list CASES_LIST_FILE_PATH] [--skip_proc]
+              [-b BINARIES] [-d] [--rebuild]
+```
+It builds out the simple project binary including WAMR runtime binary ```simple``` and the testing tool ```host_tool``` before running the test suites.
+
+Test output is like:
+```
+Test Execution Summary:
+        Success:              8
+        Cases fails:          0
+        Setup fails:          0
+        Case load fails:      0
+
+
+------------------------------------------------------------
+The run folder is [run-03-23-16-29]
+that's all. bye
+kill to quit..
+Killed
+```
+
+The detailed report and log is generated in ```run``` folder. The binaries copy is also put in that folder.
+
+Usage samples
+==============
+
+Run default test suite:
+</br>
+```python start.py```
+
+Rebuild all test apps and then run default test suite:
+</br>
+```python start.py --rebuild```
+
+Run a specified test suite:
+</br>
+```python start.py -s 01-life-cycle```
+
+Run a specified test case:
+</br>
+```python start.py -t 01-install```