[Analyzer][StreamChecker] Add note tags for file opening.

Summary:
Bug reports of resource leak are now improved.
If there are multiple resource leak paths for the same stream,
only one wil be reported.

Reviewers: Szelethus, xazax.hun, baloghadamsoftware, NoQ

Reviewed By: Szelethus, NoQ

Subscribers: NoQ, rnkovacs, xazax.hun, baloghadamsoftware, szepet, a.sidorin, mikhail.ramalho, Szelethus, donat.nagy, dkrupp, gamesh411, Charusso, martong, ASDenysPetrov, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D81407