Changes spaces to hyphens in space included urls and Sets validation errors to empty array when url is valid

[Kirishikesan]

Purpose

Issue #2274: Throwing the 500 response when refreshing the API definition page and Business info section in the Publisher - APIM 4.2.0
Issue #2273: Previous validation errors are showing for valid API definition - APIM 4.2.0 publisher

Overview

Issue #2274:
When refreshing pages with space included urls, urlmalformed error is thrown as below.

ERROR - AuthenticationValve Error while normalizing the request URI to process the authentication: 
java.net.URISyntaxException: Illegal character in path at index 61: /publisher/apis/950a0b1a-91b4-404d-8f8b-bbdd144bb1e8/business info
	at java.net.URI$Parser.fail(URI.java:2913) ~[?:?]
	at java.net.URI$Parser.checkChars(URI.java:3084) ~[?:?]
	at java.net.URI$Parser.parseHierarchical(URI.java:3166) ~[?:?]
	at java.net.URI$Parser.parse(URI.java:3125) ~[?:?]
	at java.net.URI.<init>(URI.java:600) ~[?:?]
	at org.wso2.carbon.identity.auth.service.util.AuthConfigurationUtil.getNormalizedRequestURI(AuthConfigurationUtil.java:346) ~[org.wso2.carbon.identity.auth.service_1.7.1.2.jar:?]

Issue #2273: Swagger validation errors which was thrown previously was seen even after adding a correct swagger URL.

Resolves

wso2/api-manager#2274
wso2/api-manager#2273