fix gradle createDB/dropDB/setBlankPassword

which broke during the Gradle upgrade in FINERACT-700

do not fix Flyway related migrateTenantDB & Co, as those
are proposed to be removed in FINERACT-765 anyway.  (If really
needed, some of my other WIP branches have the required changes
to make the Flyway related tasks work.)

fineract-provider/build.gradle

@@ -399,7 +399,7 @@ configurations.driver.each {File file ->
 task createDB {
     description= "Creates the Database. Needs database name to be passed (like: -PdbName=someDBname)"
     doLast {
-        sql = Sql.newInstance( 'jdbc:mysql:thin://localhost:3306/', mysqlUser, mysqlPassword, 'org.drizzle.jdbc.DrizzleDriver' )
+        def sql = Sql.newInstance( 'jdbc:mysql:thin://localhost:3306/', mysqlUser, mysqlPassword, 'org.drizzle.jdbc.DrizzleDriver' )
         sql.execute( 'create database '+"`$dbName`" )
     }
 }
@@ -407,13 +407,13 @@ task createDB {
 task dropDB {
     description= "Drops the specified database. The database name has to be passed (like: -PdbName=someDBname)"
     doLast {
-        sql = Sql.newInstance( 'jdbc:mysql:thin://localhost:3306/', mysqlUser, mysqlPassword, 'org.drizzle.jdbc.DrizzleDriver' )
+        def sql = Sql.newInstance( 'jdbc:mysql:thin://localhost:3306/', mysqlUser, mysqlPassword, 'org.drizzle.jdbc.DrizzleDriver' )
         sql.execute( 'DROP DATABASE '+"`$dbName`")
     }
 }
 task setBlankPassword {
     doLast {
-        sql = Sql.newInstance( 'jdbc:mysql:thin://localhost:3306/', mysqlUser, mysqlPassword, 'org.drizzle.jdbc.DrizzleDriver' )
+        def sql = Sql.newInstance( 'jdbc:mysql:thin://localhost:3306/', mysqlUser, mysqlPassword, 'org.drizzle.jdbc.DrizzleDriver' )
         sql.execute('USE `mifosplatform-tenants`')
         sql.execute('UPDATE mifosplatform-tenants.tenants SET schema_server = \'localhost\', schema_server_port = \'3306\', schema_username = \'mifos\', schema_password = \'mysql\' WHERE id=1;')
     }