Skylight performance improvement - Investigate to reduce disk-attach wait time in the Windows plugin

[venilnoronha]

The fs.maxDiskAttachWaitSec is set to 60 seconds to prevent failures during parallel volume requests, as access to the powershell utility is synchronized. This should be reduced once parallel disk identification is implemented. Currently, fs.getDiskNum(..) blocks during parallel execution due to synchronized access to ps.Exec(..). Therefore, parallel volume creation in e2e tests block in fs.DevAttachWait(..) for a while and so we allow a long delay here.

See #1775 and these lines for more information.

/cc @shaominchen

[tusharnt]

@shaominchen , @pshahzeb Can you please add the perf numbers after @venilnoronha's change went in.

[shaominchen]

We are putting 2 days for investigation of this issue. Will file separate issues if parallel execution can be achieved.

[shuklanirdesh82]

We are putting 2 days for investigation of this issue. Will file separate issues if parallel execution can be achieved.

mustfix for atleast investigation task (adding mustfix and investigate keywords)