GTest functional tests that include parameters and uORB messaging (#12521)

* Add kdevelop to gitignore

* Add test stubs

* Rename px4_add_gtest to px4_add_unit_gtest

* Add infrastructure to run functional tests

* Add example tests with parameters and uorb messages

* Fix memory issues in destructors in uORB manager and CDev

* Add a more real-world test of the collision prevention

Tools/run-gtest-isolated.py

@@ -0,0 +1,54 @@
+#!/usr/bin/env python
+
+from sys import argv, stderr
+from subprocess import call, check_output
+
+
+def list_all_tests(bin_path):
+    out = check_output(['./' + bin_path,"--gtest_list_tests"])
+    out = out.split("\n")
+    if len(out) > 1:
+        prefix = ''
+        tests_list = []
+        for token in out:
+            if len(token) == 0:
+                continue
+            if token[-1] == '.':
+                prefix = token
+                continue
+            if token[0] == ' ' and token[1] == ' ' and len(token) > 0:
+                tests_list.append(''.join([prefix, token[2:]]))
+                continue
+
+        return tests_list
+
+    else:
+        return []
+
+
+
+def run_tests(bin_path, tests_list, args):
+    for test in tests_list:
+        call_args = ['./' + bin_path, ' '.join(args), '--gtest_filter=*{}'.format(test)]
+        print(' '.join(call_args))
+        result = call(call_args)
+        if result != 0:
+            return result
+    return 0
+
+
+
+def main():
+    if len(argv) >= 2:
+        try:
+            exit(run_tests(argv[1], list_all_tests(argv[1]), argv[2:]))
+        except:
+            print('Error with arguments "' + ' '.join(argv[1:]) + '"')
+            raise
+    print('Runs each gtest test in a difference process')
+    print('Usage: ' + argv[0] + ' path/to/gtest.bin [GTEST_OPTIONS]')
+    exit(1)
+
+
+if __name__ == '__main__':
+    main()