Fix gateway and vc delete waiting

[ocobles]

sync equinix/terraform-provider-equinix#138

[codecov-commenter]

Codecov Report

Merging #238 (3f9fde6) into main (105e9c0) will increase coverage by 8.01%.
The diff coverage is 89.28%.

@@            Coverage Diff             @@
##             main     #238      +/-   ##
==========================================
+ Coverage   69.06%   77.08%   +8.01%     
==========================================
  Files          51       51              
  Lines        6891     6946      +55     
==========================================
+ Hits         4759     5354     +595     
+ Misses       1957     1359     -598     
- Partials      175      233      +58     

Impacted Files	Coverage Δ
metal/resource_metal_virtual_circuit.go	76.45% <66.66%> (-0.83%)	⬇️
metal/resource_metal_gateway.go	83.82% <84.00%> (+0.03%)	⬆️
metal/datasource_metal_virtual_circuit.go	95.28% <96.00%> (+27.33%)	⬆️
metal/config.go	50.94% <0.00%> (-7.55%)	⬇️
metal/resource_metal_reserved_ip_block.go	82.67% <0.00%> (+2.09%)	⬆️
metal/resource_metal_spot_market_request.go	57.85% <0.00%> (+2.29%)	⬆️
metal/helpers_device.go	82.63% <0.00%> (+2.63%)	⬆️
metal/datasource_metal_spot_market_request.go	89.69% <0.00%> (+4.12%)	⬆️
metal/resource_metal_device.go	59.15% <0.00%> (+5.16%)	⬆️
... and 10 more

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