fix(chart): revert env OPENEBS_NAMESPACE to LVM_NAMESPACE for v1.6.x

[niladrih]

The env LVM_NAMESPACE was changed to OPENEBS_NAMESPACE on the develop branch as a part of #324. This change breaks v1.6.x.

Need to investigate if it breaks develop as well.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.95%. Comparing base (8feeaa0) to head (29cdf45).
Report is 27 commits behind head on develop.

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #333      +/-   ##
===========================================
- Coverage    98.66%   97.95%   -0.71%     
===========================================
  Files            2        2              
  Lines          673      784     +111     
===========================================
+ Hits           664      768     +104     
- Misses           5        9       +4     
- Partials         4        7       +3     

Flag	Coverage Δ
bddtests	97.95% <ø> (-0.71%)	⬇️

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