Print the command when a greentea test is being run. Also fix mbedhtr…

…un not being on PATH causing all tests to pass! (ARMmbed#51)

* Print the command when a greentea test is being run.  Also fix mbedhtrun not being on PATH causing all tests to pass!

* Also remove useless -f argument to mbedhtrun (not used with --skip-flashing)

tools/cmake/mbed-run-greentea-test.in.cmake

@@ -1,14 +1,23 @@
 # This file is configured by CMake to create the script used to execute each Greentea test.
 
 # First flash the target using its configured Mbed OS upload method
+# -----------------------------------------------------------------------
 execute_process(
 	# Note: we don't use cmake --build because that performs a reconfigure of the build system each time
 	COMMAND @CMAKE_MAKE_PROGRAM@ flash-@MBED_GREENTEA_TEST_NAME@
 	WORKING_DIRECTORY @CMAKE_BINARY_DIR@
 	COMMAND_ERROR_IS_FATAL ANY)
 
 # Then run and communicate with the test
+# -----------------------------------------------------------------------
+set(MBEDHTRUN_ARGS --skip-flashing @MBED_HTRUN_ARGUMENTS@) # filled in by configure script
+
+# Print out command
+string(REPLACE ";" " " MBEDHTRUN_ARGS_FOR_DISPLAY "${MBEDHTRUN_ARGS}")
+message("Executing: mbedhtrun ${MBEDHTRUN_ARGS_FOR_DISPLAY}")
+
+# Note: For this command, we need to survive mbedhtrun not being on the PATH, so we import the package and call the main function using "python -c"
 execute_process(
-	COMMAND mbedhtrun --skip-flashing -f @MBED_GREENTEA_TEST_IMAGE_NAME@ @MBED_HTRUN_ARGUMENTS@
+	COMMAND @Python3_EXECUTABLE@ -c "import mbed_host_tests.mbedhtrun; mbed_host_tests.mbedhtrun.main()" ${MBEDHTRUN_ARGS}
 	WORKING_DIRECTORY "@CMAKE_CURRENT_BINARY_DIR@"
 	COMMAND_ERROR_IS_FATAL ANY)

tools/cmake/mbed_greentea.cmake

@@ -103,12 +103,6 @@ function(mbed_greentea_add_test)
 
     mbed_set_post_build(${MBED_GREENTEA_TEST_NAME})
 
-    if(NOT ${MBED_OUTPUT_EXT} STREQUAL "")
-        set(MBED_GREENTEA_TEST_IMAGE_NAME "${MBED_GREENTEA_TEST_NAME}.${MBED_OUTPUT_EXT}")
-    else()
-        set(MBED_GREENTEA_TEST_IMAGE_NAME "${MBED_GREENTEA_TEST_NAME}.bin")
-    endif()
-
     # User can set this cache variable to supply extra arguments to greentea.
     # such as: -d to set the drive path
     list(APPEND MBED_HTRUN_ARGUMENTS -p ${MBED_GREENTEA_SERIAL_PORT})
@@ -139,13 +133,6 @@ function(mbed_greentea_add_test)
     endif()
 
 
-    list(APPEND CONFIG_DEFS_COPY ${MBED_CONFIG_DEFINITIONS})
-    list(FILTER CONFIG_DEFS_COPY INCLUDE REGEX "MBED_CONF_PLATFORM_STDIO_BAUD_RATE")
-    if(NOT ${CONFIG_DEFS_COPY} STREQUAL "")
-        string(REGEX MATCH "[0-9]*$" BAUD_RATE ${CONFIG_DEFS_COPY})
-        list(APPEND MBED_HTRUN_ARGUMENTS "--baud-rate=${BAUD_RATE}")
-    endif()
-
     # Configure the CMake script which runs the test.
     # We have to use a helper script in order to run both the flashing and htrun in one test
     configure_file(