- Adds a --client-config-dir flag in VM create, image import and kernel
import subcommands.
- Adds field clientConfigDir in ignite configuration.
- Update v1alpha4 API and add custom conversion function for v1alpha3.

- Adds setup-private-registry.sh script to setup a local docker registry
with self-signed cert and basic auth.
- Adds test util to delete image from ignite and the runtime content
store.
- Adds e2e tests for image import with configurations set via flag and
ignite configuration.
- Enable docker registry setup only in semaphore CI for e2e tests.
- Update go version in semaphore to 1.16.3 to use os.WriteFile().

…nd TLS-ignore-verify /w tests :)

Co-Authored-By: Sunny <darkowlzz@protonmail.com>

This mainly checks if the remote resolver enforces the usage of insecure
registries when the registry server address is http.

TestPullFromAuthRegistry executes the script to set up the registries
at the beginning and stop the registries at the end of the test.

Remove registry setup from semaphore

When the registry set up script is execited from the go e2e tests, it
modified the user's default docker config permissions. Use a test config
directory to avoid modifying the default docker configuration file.