remote/exporter: refactor ser2net version check

Turn the version variable into a tuple which consists of (major, minor,
micro). Convert the exit code check to use tuples instead of strings and
also correct the version check for the YAML configuration to use a
tuple.
No functional changes intended.

Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de>

Author: Emantor

labgrid/remote/exporter.py

@@ -233,16 +233,16 @@ def _start(self, start_params):
         # Ser2net has switched to using YAML format at version 4.0.0.
         result = subprocess.run([self.ser2net_bin, "-v"], capture_output=True, text=True)
         _, _, version = str(result.stdout).split(" ")
-        major_version = version.split(".")[0]
+        version = tuple(map(int, version.strip().split(".")))
 
         # There is a bug in ser2net between 4.4.0 and 4.6.1 where it
         # returns 1 on a successful call to 'ser2net -v'. We don't want
         # a failure because of this, so raise an error only if ser2net
         # is not one of those versions.
-        if version.strip() not in ["4.4.0", "4.5.0", "4.5.1", "4.6.0", "4.6.1"] and result.returncode == 1:
+        if version not in [(4, 4, 0), (4, 5, 0), (4, 5, 1), (4, 6, 0), (4, 6, 1)] and result.returncode == 1:
             raise ExporterError(f"ser2net {version} returned a nonzero code during version check.")
 
-        if int(major_version) >= 4:
+        if version >= (4, 0, 0):
             cmd = [
                 self.ser2net_bin,
                 "-d",