Unify userProperties and tls-version separation

[gitseti]

Problem or use case

1. Currently, if more than one user property must be specified they must be separated with a "|" (pipe) symbol.

2. If more than one tls-version to support must be specified it must be separated with a ":" (colon) symbol.

The different separators may result in a confused user and is not an expected behavior.

Preferred solution or suggestions

Use the same separator for both options or omit the separation principle completely and instead require the user to specify the option more than once,
e. g:

hivemq-cli pub -t topic -m msg -up key1=value1 -up key2=value2 -up key3=value3