billing: database fixes necessitated by Liquibase update

Motivation:

[Patch](https://rb.dcache.org/r/13594/) updating Liquibase to version
4.29 omitted a necessary checksum change for a changeset for the
optional billing system.

Modification:

* Create a new changeset for the billing system with highest priority to
  update the defective checksum in the DB prior to any other changesets
  being evaluated.

* Add a new `bean` to ensure that the new changeset is loaded prior to
  any others.

Result:

Billing system will start correctly with Liquibase 4.29.

Target: master
Patch: https://rb.dcache.org/r/
Requires-notes: no
Requires-book: no
Acked-by:

modules/dcache/src/main/resources/org/dcache/services/billing/cells/billing.xml

@@ -137,7 +137,14 @@
       <property name="hourlyAggregateDataHandler" ref="hourly-aggregata-data-handler"/>
     </bean>
 
-    <bean id="liquibase" class="org.dcache.util.SpringLiquibase">
+    <bean id="liquibase-pre" class="org.dcache.util.SpringLiquibase">
+        <description>Database schema Pre-manager</description>
+        <property name="dataSource" ref="data-source"/>
+        <property name="changeLog" value="classpath:${billing.db.schema.changelog-pre}"/>
+        <property name="shouldUpdate" value="${billing.db.schema.auto}"/>
+    </bean>
+
+    <bean id="liquibase" class="org.dcache.util.SpringLiquibase" depends-on="liquibase-pre">
       <description>Database schema manager</description>
       <property name="dataSource" ref="data-source"/>
       <property name="changeLog" value="classpath:${billing.db.schema.changelog}"/>

modules/dcache/src/main/resources/org/dcache/services/billing/db/sql/00-billing.changelog-pre.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<databaseChangeLog
+     xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
+     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+     xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog
+     http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-4.29.xsd">
+
+    <!--
+    IMPORTANT:
+        This file contains changes that should be applied prior any other schema changes,
+        typically to fix liquibase or schema issues that prevent other changes from being applied.
+    -->
+
+    <changeSet id="0.1" author="greenc-FNAL" runOrder="first">
+        <comment>
+            Fix liquibase issue with duplicate id and mismatching md5sums in databasechangelog table.
+            This change set should be applied before any other changes.
+        </comment>
+
+        <sql>
+            UPDATE databasechangelog SET md5sum = '7:4c38beef9de5e3dccd4b1b0b466d3a9f' WHERE md5sum = '7:9107e2c9760619db0aab6f1f9c1ff48f';
+        </sql>
+    </changeSet>
+</databaseChangeLog>

skel/share/defaults/billing.properties

@@ -490,6 +490,8 @@ billing.db.fine-grained-truncate-before=365
 #  To enable conditional presence of database for the dcache database commands
 #
 
+(immutable)billing.db.schema.changelog-pre-when-true=org/dcache/services/billing/db/sql/00-billing.changelog-pre.xml
+(immutable)billing.db.schema.changelog-pre-when-false=
 (immutable)billing.db.schema.changelog-when-true=org/dcache/services/billing/db/sql/billing.changelog-master.xml
 (immutable)billing.db.schema.changelog-when-false=
 
@@ -498,6 +500,7 @@ billing.db.fine-grained-truncate-before=365
 #       the dcache database command will attempt to connect
 #       Hence this cannot be equal to billing.db.name in this case.
 #
+billing.db.schema.changelog-pre=${billing.db.schema.changelog-pre-when-${billing.enable.db}}
 billing.db.schema.changelog=${billing.db.schema.changelog-when-${billing.enable.db}}
 
 #