Resolve issues with not working ClassPath util class from Guava lib

ClassPath utility from Guava library used by RMB stops working under JDK 11: returns empty set of classes/interface for a given package although the classes are present. This results in errors during API endpoint classes generation and request processing by RestVerticle.

Observable issues with unit tests caused by the above problem

domain-models-interface-extensions:

• ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.178 s <<< FAILURE! - in org.folio.rest.tools.AnnotationGrabberTest
  [ERROR] org.folio.rest.tools.AnnotationGrabberTest.generateMappings Time elapsed: 0.156 s <<< ERROR!
  java.lang.NullPointerException
  at org.folio.rest.tools.AnnotationGrabberTest.generateMappings(AnnotationGrabberTest.java:21)

• [ERROR] Tests run: 1, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 0.149 s <<< FAILURE! - in org.folio.rest.tools.ClientGeneratorTest
  [ERROR] org.folio.rest.tools.ClientGeneratorTest.doesGenerateTestResourceClient Time elapsed: 0.146 s <<< FAILURE!
  java.lang.AssertionError
  at org.folio.rest.tools.ClientGeneratorTest.doesGenerateTestResourceClient(ClientGeneratorTest.java:46)

domain-models-runtime:

[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------

• [ERROR] /home/runner/work/raml-module-builder/raml-module-builder/domain-models-runtime/src/test/java/org/folio/DemoRamlRestTest.java:[15,29] cannot find symbol
  symbol: class AdminClient
  location: package org.folio.rest.client

• [ERROR] /home/runner/work/raml-module-builder/raml-module-builder/domain-models-runtime/src/test/java/org/folio/rest/Test.java:[3,29] cannot find symbol
  symbol: class AdminClient
  location: package org.folio.rest.client

• SEVERE: Implementation of org.folio.rest.jaxrs.resource.Admin not found in org.folio.rest.impl
  --------------xxxxxx-1------------------ Unable to process requestImplementation of org.folio.rest.jaxrs.resource.Rmbtests not found in org.folio.rest.impl
  java.lang.ClassNotFoundException: Implementation of org.folio.rest.jaxrs.resource.Admin not found in org.folio.rest.impl
  at org.folio.rest.tools.utils.InterfaceToImpl.convert2Impl(InterfaceToImpl.java:94)
  at org.folio.rest.RestVerticle.route(RestVerticle.java:435)
  at org.folio.rest.RestVerticle.lambda$1(RestVerticle.java:289)
  at io.vertx.ext.web.impl.RouteState.handleContext(RouteState.java:1034)
  at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:131)
  at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:133)
  at io.vertx.ext.web.handler.impl.BodyHandlerImpl$BHandler.doEnd(BodyHandlerImpl.java:296)

• SEVERE: Implementation of org.folio.rest.jaxrs.resource.Rmbtests not found in org.folio.rest.impl
  java.lang.ClassNotFoundException: Implementation of org.folio.rest.jaxrs.resource.Rmbtests not found in org.folio.rest.impl
  at org.folio.rest.tools.utils.InterfaceToImpl.convert2Impl(InterfaceToImpl.java:94)
  at org.folio.rest.RestVerticle.route(RestVerticle.java:435)
  at org.folio.rest.RestVerticle.lambda$1(RestVerticle.java:289)
  at io.vertx.ext.web.impl.RouteState.handleContext(RouteState.java:1034)
  at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:131)
  at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:133)
  at io.vertx.ext.web.handler.impl.BodyHandlerImpl$BHandler.doEnd(BodyHandlerImpl.java:296)
  at io.vertx.ext.web.handler.impl.BodyHandlerImpl$BHandler.end(BodyHandlerImpl.java:276)
  at io.vertx.ext.web.handler.impl.BodyHandlerImpl.lambda$handle$0(BodyHandlerImpl.java:87)