feat: migrate Debian/RPM package from init to systemd

[jenting]

What type of PR is this?

/kind feature

Any specific area of the project related to this PR?

/area build

What this PR does / why we need it:

Current Linux Os migrates from init to systemd, so we update the Falco Debian/RPM packages to systemd also.

Which issue(s) this PR fixes:

Fixes #1265

Special notes for your reviewer:

• tested on Ubuntu Focal

  mkdir -p build
  cd build
  cmake ..
  make package
  ls *.deb | xargs dpkg -i
  /usr/bin/falco-driver-loader
  systemctl status falco.service
  systemctl start falco.service
  systemctl status falco.service
  

• tested on CentOS 8 & openSUSE Leap 15.2

  mkdir -p build
  cd build
  cmake ..
  make package
  ls *.rpm | xargs rpm -i
  /usr/bin/falco-driver-loader
  systemctl status falco.service
  systemctl start falco.service
  systemctl status falco.service
  

Does this PR introduce a user-facing change?:

update: Debian/RPM package migrated from init to systemd
BREAKING CHANGE: the init.d service unit is not shipped anymore in deb/rpm packages in favor of a systemd service file

[poiana]

Welcome @jenting! It looks like this is your first PR to falcosecurity/falco 🎉

[leogr]

Thank you for your contribution!

Could we do the same thing for the DEB package too?

[jenting]

Thank you for your contribution!

Could we do the same thing for the DEB package too?

np! Let me make some code change and test on a Debian-based operating system.

[jenting]

Ready to be reviewed 🚀

[leogr]

/milestone 0.27.0

[fntlnz]

Hi! Thanks for your PR and the interest in bringing this up. I have a major comment

[jenting]

This is ready to review.
Ping @fntlnz @leogr

[leogr]

DEB tested with Ubuntu 20.10 👍
RPM tested with CentOS 8 👍

LGTM!!! 👏

Thank you @jenting

/cc @fntlnz
/cc @leodido

[poiana]

LGTM label has been added.

Git tree hash: 4f76e27830f9bdbd8358c119cca9b6362c8519aa

[leodido]

/hold

Need to unblock @poiana

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fntlnz, leogr

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• OWNERS [fntlnz,leogr]

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[fntlnz]

/hold cancel

[fntlnz]

I believe it's now time to drop support for init.d based systems now.

Thanks for your patience on this @jenting and for pushing this forward for almost 1.5 years!

I'm signaling this as a breaking change in the release notes.

[leogr]

👏