Remove preceding white space from cobra help template

[thelovekesh]

While printing the usage text, I noticed there is always a empty line before the usage text. This was due to not using trim marker in cobra help text template. This PR fixes that.

- What I did
Remove preceding white space from cobra help template

- How I did it
Add a trim marker before printing the help template.

- How to verify it
Before:

$ ./build/docker                              

Usage:  docker [OPTIONS] COMMAND

A self-sufficient runtime for containers

...

Build the cli on this branch and re-run the binary. Now it will output:

$ ./build/docker
Usage:  docker [OPTIONS] COMMAND

A self-sufficient runtime for containers

...

Please note the there is no line before usage text.

- Description for the changelog

Remove preceding white space from cobra help template

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

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.26%. Comparing base (7a72f38) to head (61a3b4b).
Report is 10 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5730   +/-   ##
=======================================
  Coverage   59.26%   59.26%           
=======================================
  Files         353      353           
  Lines       29540    29540           
=======================================
  Hits        17508    17508           
  Misses      11052    11052           
  Partials      980      980           

[thaJeztah]

LGTM

I did a quick rebase and squash of the two commits; I'll merge if CI is happy 😄

[thelovekesh]

Is the failing test related?

[thaJeztah]

Nope; looks like a flaky test - I kicked CI to run again;

• Flaky test: TestInitTtySizeErrors / TestRunAttachTermination #5254

[thaJeztah]

All green now 🎉