webapp queries carbon-cache for incorrect metric name if "base_fs_path" (storage.py:290) contains symlinks

[Mike Kazantsev]

Graphite seem to be trying it's best to get real metric name from a symlinked one on WhisperFile class init, but cuts path components incorrectly, if base path for all metrics contains symlinks.

Crux of a problem is that _possibly_not_real_ "base_fs_path" is stripped from "realpath(self.fs_path)".
Problem can be easily solved by making sure that base_fs_path component is also processed by realpath() function.

Simple patch for storage.py to fix the issue is attached.

[Michael Leinartas (mleinartas)]

Thanks for the patch, sorry for delay in applying