Specify int value to each enum

So that enum value is easy to reference

Signed-off-by: walteryang <walteryang47@users.noreply.github.com>
make Sunday the first day of a week

Due to behavior in java.util.Calendar.DAY_OF_WEEK

Signed-off-by: walteryang <walteryang47@users.noreply.github.com>
Add backup_method to the primary key set

Signed-off-by: walteryang <walteryang47@users.noreply.github.com>
Add dao and rest api to get VmPolicy by id and backup method

Signed-off-by: walteryang <walteryang47@users.noreply.github.com>