Silence replicator spec puts

[kbrock]

Introduced in #15990

This no longer outputs messages into the test output, and puts the messages under test

before:

...............................Replicating from server id=97000000000140, path=k1/k2 to 1 servers
Settings: {:k1=>{:k2=>{:k3=>"v3"}}}
Done
.....

after:

....................................

[kbrock]

updated to use rspec's `expect {}.to output(message).to_stdout

[chrisarcand]

Squiggly heredoc is Ruby 2.3+ (supported), so prefer <<~ instead of strip_heredoc

[NickLaMuro]

NickLaMuro requests changes to this pull request review

This should be a rubocop rule change, and not something that should be enforced by code reviewers. If you are making suggestions like this, you should be putting this up for review in the guides repo for our standard rubocop rule set, and not here.

[miq-bot]

Checked commit kbrock@a57aeac with ruby 2.3.3, rubocop 0.52.0, haml-lint 0.20.0, and yamllint 1.10.0
1 file checked, 0 offenses detected
Everything looks fine. ⭐

[kbrock]

I hadn't seen #16023 - which attempted to hide these messages as well.

updated the code to use different type of heredoc

[bdunne]

👍

[jrafanie]

Looks like all suggestions have been applied. Merging.