fix(jans-auth-server): introspection endpoint must return 401 when ORM throws "Failed to find entry" exception

[yuriyz]

Description

Introspection should return 401 instead of 500 when ORM throws "Failed to find entry" exception.

io.jans.orm.exception.EntryPersistenceException: Failed to find entry: 'tknCde=eb045d78d273107348b0300c01d29b7552d622abbc6faf81b3ec55359aa9950c,ou=tokens,o=jans'
	at io.jans.orm.sql.impl.SqlEntryManager.find(SqlEntryManager.java:380) ~[jans-orm-sql-1.0.21.jar:?]
	at io.jans.orm.impl.BaseEntryManager.find(BaseEntryManager.java:702) ~[jans-orm-core-1.0.21.jar:?]
	at io.jans.orm.impl.BaseEntryManager.find(BaseEntryManager.java:581) ~[jans-orm-core-1.0.21.jar:?]
	at io.jans.orm.impl.BaseEntryManager.find(BaseEntryManager.java:568) ~[jans-orm-core-1.0.21.jar:?]
	at jdk.internal.reflect.GeneratedMethodAccessor84.invoke(Unknown Source) ~[?:?]
	at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
	at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?]
	at org.jboss.weld.bean.proxy.AbstractBeanInstance.invoke(AbstractBeanInstance.java:38) ~[weld-core-impl-4.0.3.Final.jar:4.0.3.Final]
	at org.jboss.weld.bean.proxy.ProxyMethodHandler.invoke(ProxyMethodHandler.java:106) ~[weld-core-impl-4.0.3.Final.jar:4.0.3.Final]
	at io.jans.orm.PersistenceEntryManager$EntityManager$2057902728$Proxy$_$$_WeldClientProxy.find(Unknown Source) ~[jans-orm-core-1.0.21.jar:?]
	at io.jans.as.server.service.GrantService.load(GrantService.java:168) ~[classes/:?]
	at io.jans.as.server.service.GrantService.getGrantByCode(GrantService.java:154) ~[classes/:?]
	at io.jans.as.server.model.common.AuthorizationGrantList.getAuthorizationGrantByAccessToken(AuthorizationGrantList.java:248) ~[classes/:?]
	at io.jans.as.server.service.token.TokenService.getAuthorizationGrant(TokenService.java:106) ~[classes/:?]
	at io.jans.as.server.service.token.TokenService.getBearerAuthorizationGrant(TokenService.java:94) ~[classes/:?]
	at io.jans.as.server.introspection.ws.rs.IntrospectionWebService.getAuthorizationGrant(IntrospectionWebService.java:269) ~[classes/:?]
	at io.jans.as.server.introspection.ws.rs.IntrospectionWebService.validateAuthorization(IntrospectionWebService.java:119) ~[classes/:?]
	at io.jans.as.server.introspection.ws.rs.IntrospectionWebService.introspect(IntrospectionWebService.java:149) ~[classes/:?]
	at io.jans.as.server.introspection.ws.rs.IntrospectionWebService.introspectPost(IntrospectionWebService.java:104) ~[classes/:?]
	at io.jans.as.server.introspection.ws.rs.IntrospectionWebService$Proxy$_$$_WeldClientProxy.introspectPost(Unknown Source) ~[classes/:?]

Test cases and code coverage

• Write unit test to cover added/changed code
• Update integration tests to cover added/changed code