changing reference from EC2Slave to EC2AbstractSlave as it should be.
changing reference from EC2Slave to EC2AbstractSlave as it should be.

ikikko/ec2-plugin,barretts/ec2-plugin,mkozell/ec2-plugin,databricks/ec2-plugin,cyrille-leclerc/ec2-plugin,ikikko/ec2-plugin,Vlatombe/ec2-plugin,kunickiaj/ec2-plugin,vassilevsky/ec2-plugin,mkozell/ec2-plugin,databricks/ec2-plugin,Khan/ec2-plugin,Vlatombe/ec2-plugin,barretts/ec2-plugin,fengxx/ec2-plugin,hudson3-plugins/ec2-plugin,barretts/ec2-plugin,mkozell/ec2-plugin,ydubreuil/ec2-plugin,ikikko/ec2-plugin,cyrille-leclerc/ec2-plugin,vassilevsky/ec2-plugin,kunickiaj/ec2-plugin,arcivanov/ec2-plugin,hudson3-plugins/ec2-plugin,Vlatombe/ec2-plugin,fengxx/ec2-plugin,mtolan/ec2-plugin,Vlatombe/ec2-plugin,databricks/ec2-plugin,mtolan/ec2-plugin,cyrille-leclerc/ec2-plugin,vassilevsky/ec2-plugin,arcivanov/ec2-plugin,kunickiaj/ec2-plugin,kunickiaj/ec2-plugin,ikikko/ec2-plugin,jenkinsci/ec2-plugin,arcivanov/ec2-plugin,fengxx/ec2-plugin,mtolan/ec2-plugin,hudson3-plugins/ec2-plugin,jenkinsci/ec2-plugin,Khan/ec2-plugin,Khan/ec2-plugin,arcivanov/ec2-plugin,barretts/ec2-plugin,ydubreuil/ec2-plugin,mtolan/ec2-plugin,databricks/ec2-plugin,Khan/ec2-plugin,vassilevsky/ec2-plugin,cyrille-leclerc/ec2-plugin,jenkinsci/ec2-plugin,jenkinsci/ec2-plugin,ydubreuil/ec2-plugin,fengxx/ec2-plugin,ydubreuil/ec2-plugin,hudson3-plugins/ec2-plugin,mkozell/ec2-plugin