[Tile-serving] [openstreetmap/osm2pgsql] Remove possible dangling pointer from node_persistent_cache (#1451)

[Jochen Topf]

Storing a pointer to a string that might go away isn't a good idea.
Using std::string instead. Also slightly improved logging.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1451

-- Commit Summary --

  * Remove possible dangling pointer from node_persistent_cache

-- File Changes --

    M src/node-persistent-cache.cpp (23)
    M src/node-persistent-cache.hpp (7)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1451.patch
https://github.com/openstreetmap/osm2pgsql/pull/1451.diff

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