handle invalid utf8 characters in router configs

routerbackup

@@ -282,7 +282,7 @@ class RouterosConfig(Config):
                 iproute.append(line)
 
         stdin, stdout, stderr = self.ssh.exec_command('/system backup save dont-encrypt=yes name=autobck')
-        output = str(stdout.read(), 'utf8')
+        output = str(stdout.read(), 'utf8', 'backslashreplace')
         if not re.search('Configuration backup saved', output):
             raise RuntimeError(f'"/system backup" failed: {output.strip()}')
 
@@ -415,7 +415,7 @@ class ConfigWithShell(Config):
                     raise RuntimeError(f'shell recv timeout (after receiving {len(output)} characters)')
                 time.sleep(0.1)
             while channel.recv_ready():
-                output += str(channel.recv(65536), 'utf8')
+                output += str(channel.recv(65536), 'utf8', 'backslashreplace')
 
 
 class AsaConfig(ConfigWithShell):

routerbackup.yml

@@ -1,6 +1,6 @@
 ---
 - name: set router configuration backup directory
-  hosts: routeros,ciscoasa,!ciscoasa_slave,ciscoios,cisconexus,hpcomware
+  hosts: routeros,ciscoasa,!ciscoasa_slave,ciscoios,cisconexus,hpcomware,!no_routerbackup
   gather_facts: no
   tags: always
   tasks:
@@ -11,7 +11,7 @@
         routerbackup_maxage: 24
 
 - name: use router backup role
-  hosts: routeros,ciscoasa,!ciscoasa_slave,ciscoios,cisconexus,hpcomware
+  hosts: routeros,ciscoasa,!ciscoasa_slave,ciscoios,cisconexus,hpcomware,!no_routerbackup
   gather_facts: no
   roles:
     - routerbackup