Add option to enable persistence to the status, to allow restart-ability to the script#4

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realmgic wants to merge 7 commits intoaerospike:masterfrom realmgic:master

+85-13

Commits on Oct 10, 2019

add an option to configure timeout for the metadata service call and handle "legit" (200) exits without a status change.
realmgic
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Add the ability to persist the last status to file so the script will be restartable and will pick up where it left off
realmgic
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change the persistance default to false
realmgic
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add option to specify persistance at the command line
realmgic
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add documentation to the new command line options
realmgic
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1. add parameter to configure shorter timeout for google metadata service
realmgic
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fix documentation for timeout parameter
realmgic
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