GUACAMOLE-957: Support reading multiple LDAP server configurations from "ldap-servers.yml".

pom.xml

@@ -377,6 +377,11 @@
                 <artifactId>jackson-databind</artifactId>
                 <version>${jackson.version}</version>
             </dependency>
+            <dependency>
+                <groupId>com.fasterxml.jackson.dataformat</groupId>
+                <artifactId>jackson-dataformat-yaml</artifactId>
+                <version>${jackson.version}</version>
+            </dependency>
             <dependency>
                 <groupId>com.fasterxml.jackson.module</groupId>
                 <artifactId>jackson-module-jaxb-annotations</artifactId>