Improves jib.getDependencies.

[coollog]

Resolves issues in #1096:

• Use godirwalk.walk ( Lists files recursively in jib.getDependencies and other fixes. #1097 (comment))
• Don't walk dep if is workspace root

/cc @GoogleContainerTools/java-tools

[codecov-io]

Codecov Report

Merging #1125 into jib_skaffold will increase coverage by 0.06%.
The diff coverage is 100%.

@@               Coverage Diff               @@
##           jib_skaffold   #1125      +/-   ##
===============================================
+ Coverage         43.84%   43.9%   +0.06%     
===============================================
  Files                81      81              
  Lines              3526    3530       +4     
===============================================
+ Hits               1546    1550       +4     
  Misses             1838    1838              
  Partials            142     142

Impacted Files	Coverage Δ
pkg/skaffold/jib/jib.go	89.65% <100%> (+1.65%)	⬆️

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