Add NetBSD in platform specific logging of the specified category in RegisterCommandsTestCase()

[krytarowski]

Summary

NetBSD soon will reuse this feature while running tests.

[emaste]

We could probably replace these freebsd/linux/netbsd cases with a routine that strips trailing digits.

[krytarowski]

Thank you!

packages/Python/lldbsuite/test/functionalities/register/TestRegisters.py

def log_enable(self, category):
             self.platform = "" # TODO: add support for "log enable darwin registers"
 
         if sys.platform.startswith("freebsd"):
             self.platform = "freebsd"
 
         if sys.platform.startswith("linux"):
             self.platform = "linux"
 
+        if sys.platform.startswith("netbsd"):
+            self.platform = "netbsd"
+
         if self.platform != "":
             self.log_file = os.path.join(os.getcwd(), 'TestRegisters.log')
             self.runCmd("log enable " + self.platform + " " + str(category) + " registers -v -f " + self.log_file, RUN_SUCCEEDED)
             if not self.has_teardown:
                 def remove_log(self):
                     if os.path.exists(self.log_file):
                         os.remove(self.log_file)
                 self.has_teardown = True