improve system tests

- log import errors for test modules
- log output only on test failure
- improve docker system test container
- use go 1.19 in docker system tests
- download go dependencies in docker container
- system tests: color failues output
- imrpove test result output
- do not install golangci-lint in system tests

system/testout.py

@@ -0,0 +1,23 @@
+import tempfile
+
+
+class TestOut:
+    def __init__(self):
+        self.tmp_file = tempfile.NamedTemporaryFile(delete=False)
+        self.read_pos = 0
+
+    def fileno(self):
+        return self.tmp_file.fileno()
+
+    def write(self, text):
+        self.tmp_file.write(text.encode())
+
+    def get_contents(self):
+        self.tmp_file.seek(self.read_pos, 0)
+        return self.tmp_file.read().decode("utf-8")
+
+    def close(self):
+        self.tmp_file.close()
+
+    def clear(self):
+        self.read_pos = self.tmp_file.tell()