Update python-MapProxy to version 1.16.0 / rev 8 via SR 1107940
    
    https://build.opensuse.org/request/show/1107940
    by user bnavigator + anag+factory
    - Update to 1.16.0
      ## Improvements:
      * New cache: Azure Blob storage
      * Support for JSON legends
      * Updated layer preview to use latest openlayers
      * Official docker images released, documentation updated
      ## Fixes:
      * Fixed issues with sqlite cache (#629 and #625)
      * Dependency correction
      * library detection difficulties on some operating systems
      * encoding issues with umlauts in featureinfo
      * Several minor bugfixes
      * mapproxy-util export - derive image format from cache config