Convert all use of optparse to argparse

[mfeit-internet2]

Python's optparse will become deprecated as of 2.7.

Not earth-shattering, but needs to be done at some point.

[mfeit-internet2]

See https://docs.python.org/3/library/argparse.html#upgrading-optparse-code

[mfeit-internet2]

These programs were the ones that were modified and could use some QA to make sure they're still functioning properly:

• [ ] pscheduler-core/pscheduler-core/cancel

• [ ] pscheduler-core/pscheduler-core/clock

• [ ] pscheduler-core/pscheduler-core/monitor

• [ ] pscheduler-core/pscheduler-core/ping

• [ ] pscheduler-core/pscheduler-core/plot-schedule

• [ ] pscheduler-core/pscheduler-core/plugins

• [ ] pscheduler-core/pscheduler-core/result

• [ ] pscheduler-core/pscheduler-core/schedule

• [ ] pscheduler-core/pscheduler-core/validate-limits.raw

• [ ] pscheduler-core/pscheduler-core/watch

• [ ] pscheduler-core/pscheduler-core/troubleshoot

• [ ] pscheduler-core/pscheduler-core/task

• [ ] pscheduler-server/pscheduler-server/daemons/archiver.raw

• [ ] pscheduler-server/pscheduler-server/daemons/pause.raw

• [ ] pscheduler-server/pscheduler-server/daemons/resume.raw

• [ ] pscheduler-server/pscheduler-server/daemons/runner

• [ ] pscheduler-server/pscheduler-server/daemons/scheduler

• [ ] pscheduler-server/pscheduler-server/daemons/ticker

• [ ] pscheduler-server/pscheduler-server/database/key.raw

• [ ] pscheduler-server/pscheduler-server/utilities/limit-diags.raw

• [ ] pscheduler-server/pscheduler-server/utilities/validate-configurables.raw

• [ ] pscheduler-test-clock/clock/cli-to-spec

• [ ] pscheduler-test-disk-to-disk/disk-to-disk/cli-to-spec

• [ ] pscheduler-test-dns/dns/cli-to-spec

• [ ] pscheduler-test-http/http/cli-to-spec

• [ ] pscheduler-test-idle/idle/cli-to-spec

• [ ] pscheduler-test-idlebgm/idlebgm/cli-to-spec

• [ ] pscheduler-test-idleex/idleex/cli-to-spec

• [ ] pscheduler-test-latency/latency/cli-to-spec

• [ ] pscheduler-test-latencybg/latencybg/cli-to-spec

• [ ] pscheduler-test-netreach/netreach/cli-to-spec

• [ ] pscheduler-test-rtt/rtt/cli-to-spec

• [ ] pscheduler-test-s3throughput/s3throughput/cli-to-spec

• [ ] pscheduler-test-simplestream/simplestream/cli-to-spec

• [ ] pscheduler-test-snmpget/snmpget/cli-to-spec

• [ ] pscheduler-test-snmpgetbgm/snmpgetbgm/cli-to-spec

• [ ] pscheduler-test-snmpset/snmpset/cli-to-spec

• [ ] pscheduler-test-throughput/throughput/cli-to-spec

• [ ] pscheduler-test-trace/trace/cli-to-spec

• [ ] random-string/random-string/random-string

• [ ] scripts/PDK/templates/test.TEMPLATE/TEMPLATE/cli-to-spec

• [ ] scripts/PDK/plugin_dev

[mfeit-internet2]

Seems good.

[mfeit-internet2]

This doesn't appear to have ever been merged. Make that happen.

[mfeit-internet2]

This should be pushed into 5.1 since we're close to 5.0.