possible workaround for Proxyprint H2 issue

Author: arcuri82

em/embedded/rest/proxyprint/src/main/java/em/embedded/io/github/proxyprint/kitchen/EmbeddedEvoMasterController.java

@@ -56,7 +56,7 @@ public String startSut() {
 
         ctx = SpringApplication.run(WebAppConfig.class, new String[]{
                 "--server.port=0",
-                "--spring.datasource.url=jdbc:p6spy:h2:mem:testdb;DB_CLOSE_DELAY=-1;",
+                "--spring.datasource.url=jdbc:p6spy:h2:mem:testdb;DB_CLOSE_DELAY=-1;MVCC=true;",
                 "--spring.datasource.driver-class-name=" + P6SpyDriver.class.getName(),
                 "--spring.jpa.database-platform=org.hibernate.dialect.H2Dialect",
                 "--spring.datasource.username=sa",

em/external/rest/proxyprint/src/main/java/em/external/io/github/proxyprint/kitchen/ExternalEvoMasterController.java

@@ -94,7 +94,7 @@ public String[] getInputParameters() {
 
     public String[] getJVMParameters() {
         return new String[]{
-                "-Dspring.datasource.url=" + dbUrl(true) + ";DB_CLOSE_DELAY=-1",
+                "-Dspring.datasource.url=" + dbUrl(true) + ";DB_CLOSE_DELAY=-1;MVCC=true",
                 "-Dspring.datasource.driver-class-name=" + P6SpyDriver.class.getName(),
                 "-Dspring.jpa.database-platform=org.hibernate.dialect.H2Dialect",
                 "-Dspring.datasource.username=sa",