Add correct salt minions update

osUpgradeNode is not aware of how to update salt minions, thus is failing
when salt master looses the connection to minions. This patch add the proper
procedure to update salt minions before other packages will be updated.

Closes-Bug: PROD-35355
Change-Id: I185a121999f4a49c8b5a2a126cca0f3710149118
2 files changed