Log identity XML parsing failures as WARNING instead of ERROR:
- XML files which we receive from the network CAN be malformed by
purpose. I have already observed this in practice - the official
implementation of WOT is not the only WOT-client anymore so things can
go wrong.
- The catch of "Throwable" in IdentityFetcher was replaced with
"Exception" instead of "RuntimeException" because
bucket.getInputStream() can throw IOException
Add minor refactoring TODO