Make -a param optional for some commands

[wpjunior]

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 98.14815% with 1 line in your changes missing coverage. Please review.

Project coverage is 72.81%. Comparing base (1e295e0) to head (a7fbc73). Report is 13 commits behind head on master.

Files	Patch %	Lines
tsuru/app/app.go	85.71%	1 Missing :warning:

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #231      +/-   ##
==========================================
+ Coverage   70.89%   72.81%   +1.92%     
==========================================
  Files          55       54       -1     
  Lines        8809     9663     +854     
==========================================
+ Hits         6245     7036     +791     
- Misses       1675     1732      +57     
- Partials      889      895       +6     

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