Update postgresql version to postgresql101

[zhouhuaian]

Currently supported version of postgresql is 10.1. There is outdated versions in our testsuite.

• https://github.com/keycloak/keycloak/blob/master/testsuite/integration-arquillian/pom.xml#L441
• https://github.com/keycloak/keycloak/blob/master/testsuite/integration-arquillian/pom.xml#L454
• https://github.com/keycloak/keycloak/commit/2e7f717e508bd8361d391102d89dcc629ae2914d#diff-ef1d1adc6b3456801e99a1fd7140362bR120