systemd toolkit services should be installed to /etc

[mudler]

Reasoning behind this is simple: it removes a lot of tech debt around. even if respecting for HFS we would need to pick system dirs, it is much more easier to use /etc:

• It is respected by all distros (keep it distro agnostic first!), no weird path handling
• Avoid to use system dirs that can be symlinked - depending on distro specifics root dirs could be symlinked and clash, this is the primary reason because we had flavored toolkit packages around
• While we could use others (/usr/local) this is in use by our current design, and most importantly /usr/local is reserved for user sysadmin changes, not for vendor ones. Sticking with one which is globally recognized is much solid to my eyes (see point 1)