[sanitizer] Move *fstat to the common interceptors

Summary:
Adds *fstat to the common interceptors.

Removes the now-duplicate fstat interceptor from msan/tsan
This adds fstat to asan/esan, which previously did not intercept it.

Reviewers: eugenis, vitalybuka, aizatsky

Subscribers: tberghammer, danalbert, srhines, kubabrecka, bruening, kcc

Differential Revision: http://reviews.llvm.org/D20318

llvm-svn: 269856