Add RFC 8040 compliant error handler

Add a new error handler that formats error responses consistent
with RFC 8040 (RESTCONF) standards.

Change-Id: I67a6ab626d943115570f2e74d0a8132933726bc8
Issue-ID: CCSDK-2482
Signed-off-by: Dan Timoney <dtimoney@att.com>
diff --git a/ms/sliboot/pom.xml b/ms/sliboot/pom.xml
index 2d15080..213f02c 100644
--- a/ms/sliboot/pom.xml
+++ b/ms/sliboot/pom.xml
@@ -210,6 +210,7 @@
                             <generateApiTests>true</generateApiTests>
                             <ignoreFileOverride>${project.basedir}/.swagger-codegen-ignore</ignoreFileOverride>
                             <withXml>true</withXml>
+                            <templateDirectory>${project.basedir}/src/main/templates</templateDirectory>
                             <configOptions>
                                 <java8>true</java8>
                                 <springBootVersion>2.2.4-RELEASE</springBootVersion>