<fix>[installation]: set default RepoVersion.Strategy
<fix>[installation]: set default RepoVersion.Strategy

permissive: repo version of mn is greater than added iso
enforcing:  all of exists repo version is the same with the added iso

Resolves: ZSTAC-46108

Change-Id: I6979736662756b65766b6e6f6770736e6f777670

zstackio/zstack-utility,zstackio/zstack-utility,zstackio/zstack-utility