install.sh: add dependency check and postinst script for manual install

[syuu1228]

To install scylla-jmx using install.sh easily, we need:

• run dependency check before install
• run postinst script after install

But we don't want to run them when we build .rpm/.deb package, we also need to add --packaging option to skip them.

See scylladb/scylla#5830

[syuu1228]

@avikivity this is scylla-jmx part of merged PR scylladb/scylla#5873 pending for few months, please review