Fix permission check failures that occur in the properties realm with the security manager enabled

java.security.AccessControlException: WFSM000001: Permission check failed (permission "("java.io.FilePermission" "/store/work/tc-work/f5da3564a57e9d74/testsuite/integration/basic/target/wildfly/standalone/configuration/application-users.properties" "read")" in code source "(vfs:/content/ejb3-singleton-security.jar <no signer certificates>)" of "ModuleClassLoader for Module "deployment.ejb3-singleton-security.jar" from Service Module Loader")
  at org.wildfly.security.manager.WildFlySecurityManager.checkPermission(WildFlySecurityManager.java:309)
  at org.wildfly.security.manager.WildFlySecurityManager.checkPermission(WildFlySecurityManager.java:201)
  at java.lang.SecurityManager.checkRead(SecurityManager.java:888)
  at org.wildfly.security.manager.WildFlySecurityManager.checkRead(WildFlySecurityManager.java:374)
  at java.io.File.lastModified(File.java:949)
  at org.wildfly.extension.elytron.PropertiesRealmDefinition$RealmWrapper.reloadIfNeeded(PropertiesRealmDefinition.java:383)
  at org.wildfly.extension.elytron.PropertiesRealmDefinition$RealmWrapper.getRealmIdentity(PropertiesRealmDefinition.java:337)
  at org.wildfly.security.auth.server.ServerAuthenticationContext.assignName(ServerAuthenticationContext.java:1223)