[PATCH] Fixes bug 20587 - Add K&R break before braces style

[Roman Kashitsyn]

Fix Linux BrakeBeforeBraces style: attach left braces to structs as
shown to us by the prophets Kernighan and Ritchie.

Before:
```
namespace ns
{
class C
{
public:
  int x;
};
struct X
{
  int x;
};
}
```

After:
```
namespace ns
{
class C
{
public:
  int x;
};
struct X {
  int x;
};
}
```

http://reviews.llvm.org/D4837

Files:
  lib/Format/UnwrappedLineParser.cpp
  unittests/Format/FormatTest.cpp
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