analyze return multiple bootRecords for single real boot

This bug was originally filed in Launchpad as [LP: #1930956](https://bugs.launchpad.net/cloud-init/+bug/1930956)

Launchpad details

affected_projects = []

assignee = None

assignee_name = None

date_closed = None

date_created = 2021-06-05T08:01:29.862826+00:00

date_fix_committed = None

date_fix_released = None

id = 1930956

importance = medium

is_complete = False

lp_url = https://bugs.launchpad.net/cloud-init/+bug/1930956

milestone = None

owner = haidaocht

owner_name = Haitao Chen

private = False

status = triaged

submitter = haidaocht

submitter_name = Haitao Chen

tags = ['analyze', 'azure']

duplicates = []

_Launchpad user **Haitao Chen(haidaocht)** wrote on 2021-06-05T08:01:29.862826+00:00_

cloud-init analyze show return me multiple boot records, while I just have 1.

- CloudProvider is Azure
- default (I didn't tune anything)
- attached