feat: support hdfs kerberos

[veezhang]

What type of PR is this?

• bug
• feature
• enhancement

What problem(s) does this PR solve?

Issue(s) number:

#270

Description:

How do you solve it?

Special notes for your reviewer, ex. impact of this fix, design document, etc:

[codecov-commenter]

Codecov Report

Patch coverage: 98.20% and project coverage change: +0.69 🎉

Comparison is base (a0a27ca) 90.20% compared to head (3d65134) 90.89%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #277      +/-   ##
==========================================
+ Coverage   90.20%   90.89%   +0.69%     
==========================================
  Files          75       77       +2     
  Lines        3350     3648     +298     
==========================================
+ Hits         3022     3316     +294     
- Misses        323      326       +3     
- Partials        5        6       +1     

Impacted Files	Coverage Δ
pkg/spec/base/builder_mock.go	0.00% <0.00%> (ø)
pkg/importer/importer.go	95.38% <57.14%> (-4.62%)	⬇️
pkg/config/v3/source.go	100.00% <100.00%> (ø)
pkg/errors/import.go	100.00% <100.00%> (ø)
pkg/manager/manager.go	100.00% <100.00%> (ø)
pkg/source/hdfs.go	100.00% <100.00%> (ø)
pkg/spec/base/builder.go	100.00% <100.00%> (ø)
pkg/spec/base/filter.go	100.00% <100.00%> (ø)
pkg/spec/base/mode.go	100.00% <100.00%> (ø)
pkg/spec/v3/edge.go	100.00% <100.00%> (ø)
... and 3 more

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