Make header guards follow the coding style

Registered by Kostja Osipov

Audit all header files in tarantool code base for consistent use of header guards:
- consistent naming scheme
- header guard goes before the copyright
- each header is self-sufficient

Blueprint information

Status:
Complete
Approver:
Roman Tokarev
Priority:
Medium
Drafter:
Kostja Osipov
Direction:
Approved
Assignee:
Kostja Osipov
Definition:
Approved
Series goal:
Accepted for 1.4
Implementation:
Implemented
Milestone target:
milestone icon 1.4.0
Started by
Kostja Osipov
Completed by
Kostja Osipov

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