Merge pull request #1 in FRR/frr from master-frr-upstream-sync-2017-0…

…7-whitespace2 to master-frr-upstream-sync-2017-07

* commit '87122d314c90f2e023b5fcebe514a1ddc2a59eb9': (21 commits)
  Remove FRR-hacking.md documentation
  Add OSPF API and FRR Hacking documents
  ospf6d: crash in ospf6_lsdb_show
  bgpd: fix peer startup for labeled-unicast if linklocal address not found
  replace space to tabs, add kernel styles multiline, remove trailing whitespaces.
  Add note about bridge limitations
  whitespace internal 2
  internal reindent
  lib: route_node_lookup() needs to apply_mask() to prefix
  Add 1 more identation to correspond to kernel style multi-line comment
  ospf6d: crash in ospf6_lsdb_show
  bgpd: fix peer startup for labeled-unicast if linklocal address not found
  replace space to tabs, add kernel styles multiline, remove trailing whitespaces.
  *: reindent pt. 2
  Add note about bridge limitations
  eigrpd: remove last vty_outln
  *: reindent
  *: add indent control files
  Remove FRR-hacking.md documentation
  Add OSPF API and FRR Hacking documents
  ...

.clang-format

@@ -0,0 +1,25 @@
+---
+BasedOnStyle: LLVM
+Language: Cpp
+IndentWidth: 8
+UseTab: Always
+BreakBeforeBraces: Linux
+AlwaysBreakBeforeMultilineStrings: true
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: false
+IndentCaseLabels: false
+AlignEscapedNewlinesLeft: false
+AlignTrailingComments: true
+AllowAllParametersOfDeclarationOnNextLine: false
+AlignAfterOpenBracket: true
+SpaceAfterCStyleCast: false
+MaxEmptyLinesToKeep: 2
+BreakBeforeBinaryOperators: NonAssignment
+BreakStringLiterals: false
+SortIncludes:    false
+IncludeCategories:
+  - Regex:           '^(<|lib)'
+    Priority:        0
+CommentPragmas: '\$(FRR|clippy)'
+ContinuationIndentWidth: 8