kiwi-profile: Refactor 'export' usage

I mistakenly believed that the Bourne shell did not support the syntax
    export FOO=bar

So I used an ugly syntax of
    FOO=bar; export FOO

This patch replaces the ugly with the concise.
license: Add Apache 2.0 copyright header to nontrivial files

The non-trivial files are some scripts and the meaty install_module.mk.