requested by docker inc.

Jakub Jirutka authored 9 years ago and Natanael Copa committed 9 years ago

Default value of plugin_dir is . (current working directory). This is
bad, because plugins can't be loaded using simple name  (e.g. uwsgi
--plugin python) and absolute path must be used instead. It also breaks
some applications that use uwsgi wrappers which expects this variable to
be set correctly.

The patch is backported from https://github.com/unbit/uwsgi/pull/1217.