Improve deb pkg upgrade process (Version: 1.5 rc1)

[carlhua]

Issue Description

The current deb pk upgrade process restarts rippled process - it should only upgrade the files without restarting the process

Steps to Reproduce

The moment you do "apt-get install rippled" then apt will download and unpack and then also stop rippled and update the files and then start rippled.

Expected Result

do not stop and restart rippled

Actual Result

rippled is halted and restarted.

Environment

Deb, Ubuntu 16.04 and 18.04

Supporting Files

n/a

[MarkusTeufelberger]

How do you expect a binary to be updated while it keeps running? Or should the old version keep running after upgrading to the current one?

[mDuo13]

I think it's probably correct that updating the package restarts the service? I don't like the idea of upgrading the package but then having the old binary continue to run. That sounds like a recipe for version mismatches and hard-to-debug issues.