Change default token type of portal apps to JWT.

[dushaniw]

Fixing wso2/api-manager#2496
wso2/api-manager#2495

[codecov]

Codecov Report

Attention: 93 lines in your changes are missing coverage. Please review.

Comparison is base (28ffa8f) 41.93% compared to head (0126f51) 47.35%.
Report is 84 commits behind head on master.

Files	Patch %	Lines
.../rest/api/util/impl/OAuthJwtAuthenticatorImpl.java	0.00%	62 Missing ⚠️
...steners/GatewayTokenRevocationMessageListener.java	0.00%	14 Missing ⚠️
...ava/org/wso2/carbon/apimgt/impl/utils/APIUtil.java	0.00%	10 Missing ⚠️
...rest/api/dcr/web/impl/RegistrationServiceImpl.java	0.00%	5 Missing and 1 partial ⚠️
...2/carbon/apimgt/impl/factory/KeyManagerHolder.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #12281      +/-   ##
============================================
+ Coverage     41.93%   47.35%   +5.42%     
- Complexity     3255     4112     +857     
============================================
  Files          1831     1838       +7     
  Lines        134998   135587     +589     
  Branches      19493    19586      +93     
============================================
+ Hits          56605    64212    +7607     
+ Misses        71586    63830    -7756     
- Partials       6807     7545     +738     

Flag	Coverage Δ
integration_tests	41.98% <0.00%> (+6.79%)	⬆️
unit_tests	20.56% <0.00%> (-0.08%)	⬇️

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