APP-179 Simplify templating of docker app

[aiordache]

Signed-off-by: Anca Iordache anca.iordache@docker.com - What I did Implemented the parameters substitution using simple string replace instead of the compose loader.

- How I did it Steps:

• load content of the compose file as string.
• apply a regex to extract the parameter names matching $name or ${name}.
• use string replace to substitute the parameter names with the values provided in the parameter file/env vars.

- How to verify it Internal refactoring, shouldn't change functionality for end-users.

- Description for the changelog Simplifed docker app templating - parameter substitution done with string replace

- A picture of a cute animal (not mandatory but encouraged)

[codecov[bot]]

Codecov Report

Merging #602 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #602   +/-   ##
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  Coverage   74.58%   74.58%           
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  Files          53       53           
  Lines        2998     2998           
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  Hits         2236     2236           
  Misses        490      490           
  Partials      272      272

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[silvin-lubecki]

@ulyssessouza PTAL