DO NOT MERGE: Avoid cycle in getScheme().

[OlgaMaciaszek]

Changes necessary after merging: spring-cloud/spring-cloud-commons#937.
Only merge after the commons PR is merged.

[codecov]

Codecov Report

Merging #3983 (993f4ee) into master (9804818) will increase coverage by 0.03%.
The diff coverage is 66.66%.

@@             Coverage Diff              @@
##             master    #3983      +/-   ##
============================================
+ Coverage     55.11%   55.15%   +0.03%     
- Complexity      507      508       +1     
============================================
  Files            57       57              
  Lines          2464     2466       +2     
  Branches        228      228              
============================================
+ Hits           1358     1360       +2     
+ Misses         1019     1018       -1     
- Partials         87       88       +1     

Impacted Files	Coverage Δ	Complexity Δ
...rk/cloud/netflix/eureka/EurekaServiceInstance.java	48.00% <66.66%> (+0.17%)	8.00 <1.00> (ø)
.../netflix/eureka/server/EurekaServerConfigBean.java	22.73% <0.00%> (+0.23%)	32.00% <0.00%> (+1.00%)

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