Remove trailing spaces before new line

[cmatsuoka]

Craft-CLI messages are padded with spaces to fill the entire terminal width. This causes problems when copying and pasting output because the spaces are also copied.

Example:

$ snapcraft
Launching instance...                                                                                                                                                                 <-- ends here
Executed: repull my-part ('source' property changed)                                                                                                                                  <-- ends here
Executed: overlay my-part                                                                                                                                                             <-- ends here
Executed: build my-part                                                                                                                                                               
Executed: stage my-part                                                                                                                                                               
Executed: prime my-part                                                                                                                                                               
Executed parts lifecycle                                                                                                                                                              
Generated snap metadata                                                                                                                                                               
Created snap package my-snap-name_0.1_amd64.snap

[syncronize-issues-to-jira[bot]]

Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-3358.

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