marathonctl repo + package

[ashwanthkumar]

Repo Features

• repo add <name> <location> - Add a new package repository location
• repo update [name] - Update the package repositories locally. By default we update all the repositories, but you can choose to update just 1 too.
• repo rm <name> - Add a new package repository location
• repo ls - List the package repositories so far

Package Features

• package find <pattern> - Search for a given pattern across all the package repositories
• package info <package_name> - Shows information about the package
• package install <package_name> [version] - Install the respective package (optionally choose a version of the package)
• package uninstall <package_name> - Uninstall an installed package from the cluster

Package repository layout can be found at ashwanthkumar/marathonctl-universe#1

Things to think through

• Dependencies across packages
• Supporting multiple versions of the same package - Traffic shaping between?