Makefile: Fixing typo

A typo prevented the regexp to work properly
Makefile: Insure that state file is writeable

state file shall be writeable unless that prevents edeploy from working
Makefile: Don't copy all config files

If the cmdb files already exist, don't override it unless that would
erase all pre-exisiting installation informations
Makefile: Insure cmdb files are writable

If cmdb files are not writable that prevents edeploy from doing the
expend and generate errors
Makefile: Fixing sed command to support slashes

As path are made of slashed '/', don't use '/' a separator unless regexp
will fail