Allow drain retries even with timeout failures

[shreyas-badiger]

Fixes https://github.com/keikoproj/lifecycle-manager/issues/90

• [x] Functional testing
• [x] Unit tests

[codecov[bot]]

Codecov Report

Merging #104 (cc82768) into master (eea6b4b) will decrease coverage by 0.28%. The diff coverage is 88.88%.

@@            Coverage Diff             @@
##           master     #104      +/-   ##
==========================================
- Coverage   71.02%   70.74%   -0.28%     
==========================================
  Files          12       12              
  Lines        1239     1234       -5     
==========================================
- Hits          880      873       -7     
- Misses        296      298       +2     
  Partials       63       63              

Impacted Files	Coverage Δ
pkg/service/manager.go	67.66% <ø> (ø)
pkg/service/nodes.go	81.98% <87.50%> (-1.92%)	:arrow_down:
pkg/service/server.go	60.33% <90.00%> (-0.05%)	:arrow_down:

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