Fixes the RestClient constructors fixes

All references to salesforce_encrypt.client service removed
salesforce_encrypt.client service definition removed
Unused use statements removed from EncryptedRestClientInterface andRestCientInterface
Constructors removed from EncryptedRestClientInterface and RestClientInterface
Salesforce_encrypt\RestClient constructor cleaned up
Adds Json mock to salesforce_encrypt\RestClientTest
Fixes service name error in PullBase
Fixes property visibility settings in RestClient so child salesforce_encrypt\RestClient may
inherit them.