[MESOS-8174] clang-format incorrectly indents aggregate initializations - ASF JIRA

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Aggregate initializations are incorrectly indented. I would expect the following indention,

Foo bar{
    123,
    456,
    789};

Instead this is indented as

Foo bar{123,
        456,
        789};

Forcing a line break after the opening curly incorrectly indents the arguments with two instead of four spaces,

Foo bar{

  123,
  456,
  789};

Format a braced initializer list exactly like you would format a function call in its place.

and our style guide demands

Newline when calling or defining a function: indent with four spaces.