Makefile: Preserve state file while make install

If some do twice the make install, don't overide it.
base.install: Applying upgrades once setup

Once updates are added & updated, it's mandatory to install them unless
updates will not be applied.
init: Fixing Curl's return code mgmt

Prior this commit the return code wasn't properly caugth leading to
false positive/negative cases.

This patch put curl in background to gain its pid and make a wait call
on it once the process died to estimate if curl got sucessful or not.