finalize list of media types

[pnpavlov]

We have new file endings:

chroot.test.log
chroot.test.xml
platform.test.log
platform.test.xml
uki

[mxmxchere]

The new endings are not included yet

[mxmxchere]

Add .uki

[pnpavlov]

@nkraetzschmar plese double check if correct