Change shell invocations to kubernetes/helm library calls for Sacred deployment

[archena]

Is your feature request related to a problem? Please describe.
Currently experiment tracker installation is done by invoking kubectl and helm command line tools. If these were replaced with python libraries for Kubernetes and helm it would solve two problems:

1. The users would no longer be required to have kubectl and helm installed (or use Docker container), for installation and uninstallation to work
2. The installation/uninstallation process would be more predictable, i.e. it's easier to capture failures while using python native libraries as opposed to shell invocations

Describe the solution you'd like

• Use Kubernetes python package instead of kubectl calls
• Find and use suitable helm python package instead of helm calls

Additional context
#6 partially depends on this issue, i.e. if it is resolved prior #6, testing will be done using Python native libraries rather than parsing responses from CLI tools