test: update example and unit tests with new import roles:

tiny_test_fw is a python package now. import it using normal way.

examples/peripherals/can/can_network/example_test.py

@@ -1,18 +1,9 @@
 # Need Python 3 string formatting functions
 from __future__ import print_function
 
-import os
-import sys
 from threading import Thread
-try:
-    import IDF
-except ImportError:
-    # The test cause is dependent on the Tiny Test Framework. Ensure the
-    # `TEST_FW_PATH` environment variable is set to `$IDF_PATH/tools/tiny-test-fw`
-    test_fw_path = os.getenv("TEST_FW_PATH")
-    if test_fw_path and test_fw_path not in sys.path:
-        sys.path.insert(0, test_fw_path)
-    import IDF
+
+import ttfw_idf
 
 # Define tuple of strings to expect for each DUT.
 master_expect = ("CAN Master: Driver installed", "CAN Master: Driver uninstalled")
@@ -36,7 +27,7 @@ def dut_thread_callback(**kwargs):
     result[0] = True
 
 
-@IDF.idf_example_test(env_tag='Example_CAN2', ignore=True)
+@ttfw_idf.idf_example_test(env_tag='Example_CAN2')
 def test_can_network_example(env, extra_data):
 
     # Get device under test. "dut1", "dut2", and "dut3" must be properly defined in EnvConfig