Before deleting, check if there are other configurations using the same backend. If there are, do not proceed with the deletion

[wujiuye]

…me backend. If there are, do not proceed with the deletion (#374)

[codecov[bot]]

Codecov Report

Patch coverage: 80.92% and project coverage change: -1.67% :warning:

Comparison is base (3a96f68) 79.31% compared to head (01f0b82) 77.65%. Report is 17 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #375      +/-   ##
==========================================
- Coverage   79.31%   77.65%   -1.67%     
==========================================
  Files          23       24       +1     
  Lines        1750     2112     +362     
==========================================
+ Hits         1388     1640     +252     
- Misses        278      373      +95     
- Partials       84       99      +15     

Flag	Coverage Δ
e2e	0.00% <ø> (∅)
unit	80.39% <80.92%> (+1.07%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
controllers/terraform/status.go	77.41% <ø> (ø)
e2e/normal/regression.go	0.00% <ø> (ø)
controllers/configuration/configuration.go	89.43% <80.00%> (-5.97%)	:arrow_down:
controllers/configuration_controller.go	79.66% <81.11%> (+2.30%)	:arrow_up:

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