Minor change to allow reading in scopes from YAML list

[kenyattaclark]

I encountered an issue using the okta.yaml and OAuth 2.0 and specifying multiple scopes. The DefaultClientBuilder assumes that the scopes will be space delimited but the YAMLPropertiesSource loads the scopes into a comma delimited property. I made a slight change to accommodate space and comma delimited scopes properties.

[codecov-commenter]

Codecov Report

Merging #379 into master will decrease coverage by 3.75%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #379      +/-   ##
============================================
- Coverage     70.91%   67.16%   -3.76%     
+ Complexity     1127     1058      -69     
============================================
  Files           120      120              
  Lines          3624     3624              
  Branches        566      566              
============================================
- Hits           2570     2434     -136     
- Misses          868      995     +127     
- Partials        186      195       +9     

Impacted Files	Coverage Δ	Complexity Δ
...com/okta/sdk/impl/client/DefaultClientBuilder.java	67.28% <100.00%> (ø)	40.00 <0.00> (ø)
...om/okta/sdk/impl/http/authc/SswsAuthenticator.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-2.00%)
...om/okta/sdk/impl/resource/DefaultGroupBuilder.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-5.00%)
...ava/com/okta/sdk/impl/error/DefaultErrorCause.java	0.00% <0.00%> (-87.50%)	0.00% <0.00%> (-5.00%)
...a/sdk/impl/resource/DefaultExtensibleResource.java	0.00% <0.00%> (-80.00%)	0.00% <0.00%> (-2.00%)
...ta/sdk/impl/ds/DefaultCacheRegionNameResolver.java	25.00% <0.00%> (-75.00%)	1.00% <0.00%> (-1.00%)
...va/com/okta/sdk/impl/ds/cache/ReadCacheFilter.java	42.85% <0.00%> (-57.15%)	1.00% <0.00%> (-2.00%)
...a/com/okta/sdk/impl/resource/ReferenceFactory.java	50.00% <0.00%> (-50.00%)	1.00% <0.00%> (-1.00%)
...om/okta/sdk/impl/resource/DefaultVoidResource.java	40.00% <0.00%> (-40.00%)	1.00% <0.00%> (-1.00%)
...com/okta/sdk/impl/resource/DefaultUserBuilder.java	46.59% <0.00%> (-30.69%)	16.00% <0.00%> (-11.00%)
... and 16 more

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