Merge 1.5.5 changes back to master.

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-mysql/src/main/java/org/apache/guacamole/auth/mysql/conf/MySQLEnvironment.java

@@ -80,7 +80,7 @@ public class MySQLEnvironment extends JDBCEnvironment {
      * The default value for the default maximum number of connections to be
      * allowed per user to any one connection.
      */
-    private final int DEFAULT_MAX_CONNECTIONS_PER_USER = 1;
+    private final int DEFAULT_MAX_CONNECTIONS_PER_USER = 0;
 
     /**
      * The default value for the default maximum number of connections to be

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-postgresql/src/main/java/org/apache/guacamole/auth/postgresql/conf/PostgreSQLEnvironment.java

@@ -81,7 +81,7 @@ public class PostgreSQLEnvironment extends JDBCEnvironment {
      * dictate the values that should be used in the absence of the correct
      * properties.
      */
-    private final int DEFAULT_MAX_CONNECTIONS_PER_USER = 1;
+    private final int DEFAULT_MAX_CONNECTIONS_PER_USER = 0;
 
     /**
      * The default value for the default maximum number of connections to be

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-sqlserver/src/main/java/org/apache/guacamole/auth/sqlserver/conf/SQLServerEnvironment.java

@@ -63,7 +63,7 @@ public class SQLServerEnvironment extends JDBCEnvironment {
      * The default value for the default maximum number of connections to be
      * allowed per user to any one connection.
      */
-    private static final int DEFAULT_MAX_CONNECTIONS_PER_USER = 1;
+    private static final int DEFAULT_MAX_CONNECTIONS_PER_USER = 0;
 
     /**
      * The default value for the default maximum number of connections to be