[server][bugfix] Fix OGC test recommendations

[pblottiere]

Description

This PR fixes the OGC test recommendations (abstracts, keywordlists and metadataurls) which is currently failing: http://test.qgis.org/ogc_cite/2017_11_08_18_00_wms_1_3_0.html#fa4d94ab-1902-41e8-b5d9-738d7c52eac0/d1e17382_1

I took a look on GetCapabilities response from geoserver (http://cite.demo.opengeo.org:8080/geoserver_wms13/wms?service=wms&request=getcapabilities&version=1.3.0) and it seems that the root layer has <Title/> and <Abstract/> fields. But in QGIS Server, we currently have <Name/> and <Title/> instead.

By replacing <Name/> field with <Abstract/> for the root layer, OGC tests are green.

Checklist

• Commit messages are descriptive and explain the rationale for changes
• Commits which fix bugs include fixes #11111 in the commit message next to the description
• Commits which add new features are tagged with [FEATURE] in the commit message
• Commits which change the UI or existing user workflows are tagged with [needs-docs] in the commit message and containt sufficient information in the commit message to be documented
• I have read the QGIS Coding Standards and this PR complies with them
• This PR passes all existing unit tests (test results will be reported by travis-ci after opening this PR)
• New unit tests have been added for core changes
• I have run the scripts/prepare-commit.sh script before each commit

[rldhont]

If you removed <Name> from the root layer, you have to update the UI and the server to remove the capability to defined and use a shortName for the project.
If you removed <Name> from the root layer, you removed the ability to use the root layer in other request like GetLegendGraphics or GetMap.
Can we conserved <Name> and add <Abstract> to passed the test ?

[pblottiere]

Can we conserved and add to passed the test ?

I just tested and yes we can.

However, if i keep the <Name>, then it's still considered as a layer as such and I have to add a <MetadataURL> and a <KeywordList> entry for the root layer to have every OGC tests green.

@rldhont What do you think? What kind of data can I indicated for metadata and keywords for the root layer?

[rldhont]

Does the <MetadataUrl/> has to have a value ?
The <KeywordList> could be the same as the service.

[pblottiere]

Does the <MetadataUrl/> has to have a value ?

Nope.

The <KeywordList> could be the same as the service.

OK.

[pblottiere]

@rldhont I updated code accordingly. Let me know what you think.

If you're OK with my changes, I'll update unit tests too.

[pblottiere]

recommendations OGC tests are green now: http://test.qgis.org/ogc_cite/2017_11_16_10_50_wms_1_3_0.html#1bb0b94b-6f4b-423c-a6dd-3aa364c5ce81/d1e17382_1