Fix references to masterapi in daemons.ioflo.master

************* Module salt.daemons.ioflo.master
salt/daemons/ioflo/master.py:63: [E1101(no-member), RemoteMaster.postioinit] Module 'salt' has no 'masterapi' member
salt/daemons/ioflo/master.py:96: [E1101(no-member), LocalMaster.postioinit] Module 'salt' has no 'masterapi' member
Merge pull request #10353 from cvrebert/patch-1

Fix references to masterapi in daemons.ioflo.master