Fix the issues in the MySQL NDB cluster DB script

[HeshanSudarshana]

This PR fixes the issues in the MySQL NDB cluster DB script.

Fixes wso2/api-manager#1754

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (a4dd97d) 42.27% compared to head (d36d69e) 41.92%.
Report is 19 commits behind head on master.

Files	Patch %	Lines
.../api/publisher/v1/common/mappings/ImportUtils.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #12223      +/-   ##
============================================
- Coverage     42.27%   41.92%   -0.35%     
+ Complexity     3224     3200      -24     
============================================
  Files          1816     1816              
  Lines        133958   133878      -80     
  Branches      19362    19343      -19     
============================================
- Hits          56628    56129     -499     
- Misses        70526    71011     +485     
+ Partials       6804     6738      -66     

Flag	Coverage Δ
integration_tests	35.06% <0.00%> (-0.49%)	⬇️
unit_tests	20.77% <0.00%> (+0.01%)	⬆️

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