Improve error message when using self-signed certificate

[szh]

Desired Outcome

Conjur CLI message when not using --self-signed with self signed cert should be improved

Implemented Changes

• In the init command, if there's an error retrieving or validating the server certificate, and the --self-signed flag is not provided, print "If you're attempting to use a self-signed certificate, re-run the init command with the --self-signed flag"

Connected Issue/Story

CyberArk internal issue ID: CNJR-506

Definition of Done

At least 1 todo must be completed in the sections below for the PR to be
merged.

Changelog

• The CHANGELOG has been updated, or
• This PR does not include user-facing changes and doesn't require a
  CHANGELOG update

Test coverage

• This PR includes new unit and integration tests to go with the code
  changes, or
• The changes in this PR do not require tests

Documentation

• Docs (e.g. READMEs) were updated in this PR
• A follow-up issue to update official docs has been filed here: [insert issue ID]
• This PR does not require updating any documentation

Behavior

• This PR changes product behavior and has been reviewed by a PO, or
• These changes are part of a larger initiative that will be reviewed later, or
• No behavior was changed with this PR

Security

• Security architect has reviewed the changes in this PR,
• These changes are part of a larger initiative with a separate security review, or
• There are no security aspects to these changes

[codeclimate]

Code Climate has analyzed commit 2c6bf5b and detected 1 issue on this pull request.

Here's the issue category breakdown:

Category	Count
Style	1

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 81.0% (0.0% change).

View more on Code Climate.

[doodlesbykumbi]

I thought I had other comments. LGTM just a clarification comment

[doodlesbykumbi]

Just to confirm this is to capture the idea that this docker-compose environment is only ever run with the working directory set to where the docker-compose.yml file is ?

[szh]

Yeah. This is used in the CI script and this path was incorrect to begin with from what I can tell. I only realized it when I tried to use the proxy service in the course of testing.