Maxscale 2.5.9 no longer allows `readwritesplit` router for read-only services

Mar 16 18:39:36 maxscale-staging-1 maxscale[3565997]: (931) [mariadbclient] Routing the query failed. Session will be closed.

Mar 16 18:39:54 maxscale-staging-1 maxscale[3565997]: (932) [readwritesplit] (mariadb-reporting-service) [mariadb-reporting-service] Write query received from tocktix7@::ffff:10.8.11.4. Could not find a valid master connection. Closing

client connection.

Mar 16 18:39:54 maxscale-staging-1 maxscale[3565997]: (932) [readwritesplit] (mariadb-reporting-service) Could not find valid server for target type TARGET_MASTER (COM_QUERY: /* Username: mieko@tockhq.com, Task ID: 581faba5-0c08-4661-9b

55-48f2e4b91991, Scheduled: False, Query Hash: 0e1a2394e409cfa1542e82c8e57f4ce8, Queue: queries, Query ID: adhoc */ select business.name, business.id, business_details.address_lat, business_details.address_lng, business.is_deleted, busi

ness.is_authorized_by_tock, business.created_at

from business_details

join business on business.business_details_id = business_details.id

where business_details.address_lat is null

;), closing connection.

name: [node_secondary-0] status: [Slave, Running] state: [IN_USE] last opened at: [Tue Mar 16 18:39:54 2021] last closed at: [not closed] last close reason: [] num sescmd: [0]

name: [node_secondary-1] status: [Slave, Running] state: [IN_USE|WAITING_RESULT] last opened at: [Tue Mar 16 18:39:54 2021] last closed at: [not closed] last close reason: [] num ses

cmd: [1]