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When the "library" part of a "plugin" configuration stanza does not contain at least one path separator, treat it as a filename and assume it is a name of a shared object present in the named plugin installation directory. Absolute and relative paths can still be used and will be used verbatim. Get the full path to a plugin before attempting to check/register it so that all relevant log messages include the same plugin path (apart from the one logged when the full path cannot be determined). (cherry picked from commit 1a9fc624)
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