Correct the logic for running 'ceph-disk prepare'
Correct the logic for running 'ceph-disk prepare'

The logic was broken here for repeated runs.  We only want to run
'ceph-disk prepare' when the disk does not contain a ceph partition, is
not a partition, and raw_multi_journal is set.  Previously it would
attempt to run 'ceph-disk prepare' when there was a ceph partition
because the second half of the 'or' was still true since it isn't a
partition.

thetrav/ceph-ansible,msambol/ceph-ansible,leseb/ceph-ansible-1,albertomurillo/ceph-ansible,lejonet/ansible-ceph-common,WingkaiHo/ceph-ansible,Miand/ceph-ansible-centos-6.6,lyandrew/ceph-ansible,jfcoz/ceph-ansible,verdurin/ceph-ansible-1,AcalephStorage/ceph-ansible,jsaintrocc/ceph-ansible,mcsage/ceph-ansible,guits/ceph-ansible,travmi/ceph-ansible,mattt416/ceph-ansible,nkmail/ceph-ansible,sheepkiller/ceph-ansible,jfcoz/ceph-ansible,jsaintrocc/ceph-ansible,mcsage/ceph-ansible,font/ceph-ansible,albertomurillo/ceph-ansible,Abhishekvrshny/ceph-ansible,nkmail/ceph-ansible,sheepkiller/ceph-ansible,verdurin/ceph-ansible-1,albertomurillo/ceph-ansible,thiagodasilva/ceph-ansible,Miand/ceph-ansible-centos-6.6,bengland2/ceph-ansible,msambol/ceph-ansible,dang/ceph-ansible,ceph/ceph-ansible,ceph/ceph-ansible,PiotrProkop/ceph-ansible,Abhishekvrshny/ceph-ansible,fgal/ceph-ansible,bengland2/ceph-ansible,guits/ceph-ansible,thiagodasilva/ceph-ansible,font/ceph-ansible,PiotrProkop/ceph-ansible,dang/ceph-ansible,fgal/ceph-ansible,jtaleric/ceph-ansible,travmi/ceph-ansible,mattt416/ceph-ansible,thetrav/ceph-ansible,rootfs/ceph-ansible,leseb/ceph-ansible-1,lyandrew/ceph-ansible,WingkaiHo/ceph-ansible,WingkaiHo/ceph-ansible,rootfs/ceph-ansible,jtaleric/ceph-ansible,AcalephStorage/ceph-ansible