Bug 2235395: core: return valid CIDR ip #546

Job	Run time
canary	21m 48s
raw-disk	27m 9s
two-osds-in-device	21m 38s
osd-with-metadata-device	17m 0s
encryption	17m 41s
lvm	15m 29s
pvc	15m 47s
pvc-db	19m 52s
pvc-db-wal	18m 50s
encryption-pvc	15m 57s
encryption-pvc-db	18m 18s
encryption-pvc-db-wal	21m 31s
encryption-pvc-kms-vault-token-auth	25m 27s
encryption-pvc-kms-ibm-kp	3m 58s
encryption-pvc-kms-vault-k8s-auth	17m 54s
lvm-pvc	13m 54s
multi-cluster-mirroring	27m 3s
csi-hostnetwork-disabled	21m 2s
rgw-multisite-testing	27m 56s
multus-cluster-network	24m 15s
	6h 32m 29s

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