hv_snapshot: port Linux patch, increase timeout of vss backup operations
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Authored by avg on Nov 11 2019, 1:29 PM.

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Summary

This is based on a Linux change b357fd3908c1191f2.
This patch increases timeout of the VSS_OP_FREEZE operation to 15 minutes.
I believe, but have not confirmed yet, that this should fix diagnostic
messages that users see:

kernel: (da2:storvsc0:0:0:2): Retrying command (per sense data)
kernel: (da2:storvsc0:0:0:2): WRITE(10). CDB: 2a 00 14 2e 0e 00 00 00 08 00 
kernel: (da2:storvsc0:0:0:2): CAM status: SCSI Status Error
kernel: (da2:storvsc0:0:0:2): SCSI status: Check Condition
kernel: (da2:storvsc0:0:0:2): SCSI sense: UNIT ATTENTION asc:3f,2 (Changed operating definition)