tizen-distro: configure combo-layer

tizen-distro: configure combo-layer

Up to this point, the tizen-distro repository is identical to the poky
master branch minus the "yocto" and "documentation" parts. It was created
by checking out 081fddd3e464935e5f438a7686eb8f8856da6281 (the commit where
"dizzy" was branched off from master) and stripping out these undesired files
with: git filter-branch --prune-empty --tree-filter 'rm -rf *yocto* documentation' HEAD

Then the last_revision properties for bitbake and openembedded-core were set
based on the commit messages generated in poky by the combo-layer commit hook.
Because these extra comments are useful, the same commit hooks are also
used in tizen-distro.

Now the repository is ready for importing the other components.