[HTE @ clang-tidy] Enable clang-tidy configs inheretence for caffe2 project

Summary:
The primary HTE configuration (for `HTE@clang-tidy` project) is stored at the parent config `~/fbsource/fbcode.clang-tidy`. The diff enables inheretence of that configuration.

Note: `facebook-hte-` checks will not be used until switch to HTE2clang-tidy be made.
Note: `clang-diagnostic-*` will start work. As result clang warning messages can be dublicated: one time from HTE and another time from clang-diagnostic

Test Plan: N/A

Reviewed By: wfarner

Differential Revision: D24099167

fbshipit-source-id: 2e092fe678ad3e53a4cef301ce1cb737cf8401e7

.clang-tidy

@@ -1,6 +1,7 @@
 ---
 # NOTE there must be no spaces before the '-', so put the comma last.
-Checks: '-*,
+InheritParentConfig: true
+Checks: '
 bugprone-*,
 -bugprone-forward-declaration-namespace,
 -bugprone-macro-parentheses,
@@ -17,6 +18,7 @@ cppcoreguidelines-*,
 -cppcoreguidelines-pro-type-union-access,
 -cppcoreguidelines-pro-type-vararg,
 -cppcoreguidelines-special-member-functions,
+-facebook-hte-RelativeInclude,
 hicpp-exception-baseclass,
 hicpp-avoid-goto,
 modernize-*,
@@ -27,7 +29,7 @@ modernize-*,
 -modernize-use-trailing-return-type,
 performance-*,
 -performance-noexcept-move-constructor,
-  '
+'
 HeaderFilterRegex: 'torch/csrc/.*'
 AnalyzeTemporaryDtors: false
 CheckOptions: