Remove passwd from bundled configurations

The configurations still used the old parameter name.

test/maxscale_test_secondary.cnf

@@ -16,7 +16,7 @@ type=monitor
 module=mariadbmon
 servers=server1,server2,server3,server4
 user=maxuser
-passwd=maxpwd
+password=maxpwd
 monitor_interval=10000
 
 [RW-Split-Router]
@@ -24,7 +24,7 @@ type=service
 router=readwritesplit
 servers=server1,server2,server3,server4
 user=maxuser
-passwd=maxpwd
+password=maxpwd
 max_slave_connections=100%
 
 [SchemaRouter-Router]
@@ -32,7 +32,7 @@ type=service
 router=schemarouter
 servers=server1,server2,server3,server4
 user=maxuser
-passwd=maxpwd
+password=maxpwd
 auth_all_servers=1
 
 [RW-Split-Hint-Router]
@@ -40,7 +40,7 @@ type=service
 router=readwritesplit
 servers=server1,server2,server3,server4
 user=maxuser
-passwd=maxpwd
+password=maxpwd
 max_slave_connections=100%
 filters=Hint
 
@@ -50,7 +50,7 @@ router=readconnroute
 router_options=master
 servers=server1
 user=maxuser
-passwd=maxpwd
+password=maxpwd
 
 [Hint]
 type=filter