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Removed unused code from com.cloud.api.ApiServer**Removed \_ from variables names**: private variables with \_ at the beginning is common in C++ but not in Java. **Removed unused code from ApiServer:** - com.cloud.api.ApiServer.getPluggableServices(): unused method; - com.cloud.api.ApiServer.getApiAccessCheckers(): unused method; **Methods and variables access level reviewed:** - com.cloud.api.ApiServer.handleAsyncJobPublishEvent(String, String ,Object): this method was private but the annotation @MessageHandler requests public methods, as can be seen in org.apache.cloudstack.framework.messagebus.MessageDispatcher.buildHandlerMethodCache(Class\<?\>), which searches methods with the @MessageHandler annotation and changes it to be accessible (setAccessible(true)). Thus, there is no reason for handleAsyncJobPublishEvent be a private method and lead some other dev to wrong conclusions about the use of the method; - Global variables and methods called just by this class (ApiServer) were changed to private. **Changed variables and methods from static to non-static (if possible):** as some variables/methods are used just by one object of this class, instantiated by Spring, they were changed to non-static. With that, calls from com.cloud.api.ApiServlet.ApiServlet() that used static methods from ApiServer, were changed from ApiServer.\<staticMethodName\> to \_apiServer.\<methodName\> that refers to the org.apache.cloudstack.api.ApiServerService interface. Thus, methods com.cloud.api.ApiServer.getJSONContentType() and com.cloud.api.ApiServer.isSecureSessionCookieEnabled() had to be added in the interface (org.apache.cloudstack.api.ApiServerService, interface implemented by class ApiServer). * pr/1263: The goal of this PR is to review com.cloud.api.ApiServer class, with the following actions: Signed-off-by: Will Stevens <williamstevens@gmail.com>