Convert formatting automatically to f-strings

Automatically convert formatting with the following call:
flynt -ll 2000 -v frappy*
Result: 303/381 auto-converted.
Failing conversions will be looked at manually in a follow-up commit.

Change-Id: Icd996b27221202faccc15af78e0380cf52ee37f2
Reviewed-on: https://forge.frm2.tum.de/review/c/secop/frappy/+/30900
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Georg Brandl <g.brandl@fz-juelich.de>
Reviewed-by: Alexander Zaft <a.zaft@fz-juelich.de>

frappy_demo/lscsim.py

@@ -66,7 +66,7 @@ class Ls370Sim(Communicator):
                 self._data['RDGST?%d' % channel] = '0'
 
     def communicate(self, command):
-        self.comLog('> %s' % command)
+        self.comLog(f'> {command}')
 
         chunks = command.split(';')
         reply = []
@@ -86,7 +86,7 @@ class Ls370Sim(Communicator):
                         self.data[qcmd] = arg
                         break
         reply = ';'.join(reply)
-        self.comLog('< %s' % reply)
+        self.comLog(f'< {reply}')
         return reply