ETS depends on external services

[lgoltz]

This ETS depends on external WMS. On of three hardcoded WMS are used, if all of them are unavailable a test run fails.
The WMS URL is selected here:

ets-wms-client13/src/main/scripts/ctl/main.ctl

Lines 44 to 54 in d8f5c61

	<xsl:choose>
	<xsl:when test="doc-available('http://cite.deegree.org/deegree-webservices-3.3.14-2/services/wms?service=WMS&amp;version=1.3.0&amp;request=GetCapabilities')">
	<xsl:value-of select="'http://cite.deegree.org/deegree-webservices-3.3.14-2/services/wms?service=WMS&amp;version=1.3.0&amp;request=GetCapabilities'"/>
	</xsl:when>
	<xsl:when test="doc-available('http://cite.demo.opengeo.org:8080/geoserver_wms13/wms?service=WMS&amp;request=GetCapabilities&amp;version=1.3.0')">
	<xsl:value-of select="'http://cite.demo.opengeo.org:8080/geoserver_wms13/wms?service=WMS&amp;request=GetCapabilities&amp;version=1.3.0'"/>
	</xsl:when>
	<xsl:otherwise>
	<xsl:value-of select="'http://services.interactive-instruments.de/cite-xs-46/cite/cgi-bin/wms/wms/wms?request=GetCapabilities&amp;version=1.3'"/>
	</xsl:otherwise>
	</xsl:choose>

Furthermore not all test cannot be passed if one or more layers are not provided by the external service.

The ETS should be independent of an external service or at least the URLs must be checked. Furthermore the available Layers should be parsed from the Capabilities.