Rename struct metadata::Component

Renaming the struct to fix the following warning:

    .../base/orogen/std/.orogen/typekit/transports/corba/stdTypes.idl:24: Warning: Identifier 'Component' clashes with CORBA 3 keyword 'component'

Note: Im not inclined to any particular name, I just chose one to make the PR -- feel free to suggest better solutions ,-)

Needs this [PR](https://github.com/rock-core/base-orogen-std/pull/3)!

Signed-off-by: Martin Zenzes martin.zenzes@dfki.de