Add dependency to sudo

[yotabits]

Having sudo installed is mandatory to run rosdep properly.

[codecov-io]

Codecov Report

Merging #680 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #680   +/-   ##
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  Coverage   75.46%   75.46%           
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  Files          32       32           
  Lines        2967     2967           
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  Hits         2239     2239           
  Misses        728      728

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[tfoote]

Although not technically necessary as it could be used as root. I think this is good to add as it is necessary for all of our recommended usages as non-root.

[yotabits]

Although not technically necessary as it could be used as root. I think this is good to add as it is necessary for all of our recommended usages as non-root.

Also when deploying in docker it allows to not to have to install sudo manually prior to any rosdep call :)