bad exception parsing in owslib.util.openURL

[mat-kos]

# check for service exceptions without the http header set if 'Content-Type' in req.headers and \ req.headers['Content-Type'] in ['text/xml', 'application/xml', 'application/vnd.ogc.se_xml']: # just in case 400 headers were not set, going to have to read the xml to see if it's an exception report.

In the code example provided above (util.openURL function), Content-Type value is checked only against MIME type, so errors with content types like "text/xml;charset=utf-8" won't be handled.

I think this check would be better:
re.sub(";.*$", "", req.headers['Content-Type') in ['text/xml', 'application/xml', 'application/vnd.ogc.se_xml']:

[github-actions]

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