xcl: Proper xenstore release of a domain
xcl: Proper xenstore release of a domain

Makes things easier for xenstore to release a domain,
when shutting down from the toolstack (i.e. not guest
initiated). Fixes #8

Signed-off-by: Joao Martins <a704015d32795440d252cd22658497479b9c5b9e@neclab.eu>

seemoo-lab/cosmos,cnplab/cosmos,seemoo-lab/cosmos,cnplab/cosmos,seemoo-lab/cosmos,cnplab/cosmos,cnplab/cosmos,seemoo-lab/cosmos