Adding example in NI-DC Power , NI-DMM , NI-Switch

[bkumarng-NI]

• This contribution adheres to CONTRIBUTING.md
• I've updated CHANGELOG.md.
• I've added tests applicable for this pull request

What does this Pull Request accomplish?

• One additional example added in dcpower, dmm and switch drivers.
• nidcpower_hardware_timed_single_point.py, nidmm_triggered_fetch_waveform.py, niswitch_software_scanning.py
• Update CHANGELOG.md to call out the new examples in unreleased section.

List issues fixed by this Pull Request below, if any.

None

What testing has been done?

• tox completed successfully.
• pytest src/nidmm/system_tests -c generated/nidmm/tox-system_tests.ini
• pytest src/nidcpower/system_tests -c generated/nidcpower/tox-system_tests.ini
• pytest src/niswitch/system_tests -c generated/niswitch/tox-system_tests.ini

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.10%. Comparing base (5387cd9) to head (7a997bc).

❗ There is a different number of reports uploaded between BASE (5387cd9) and HEAD (7a997bc). Click for more details.

HEAD has 10 uploads less than BASE

Flag	BASE (5387cd9)	HEAD (7a997bc)
nimodinstsystemtests	1	0
nisesystemtests	1	0
niswitchsystemtests	1	0
nidmmsystemtests	1	0
niscopesystemtests	1	0
nidigitalsystemtests	1	0
nirfsgsystemtests	1	0
nifgensystemtests	1	0
nidcpowersystemtests	1	0
nitclksystemtests	1	0

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2192      +/-   ##
==========================================
- Coverage   89.32%   82.10%   -7.22%     
==========================================
  Files          73       29      -44     
  Lines       19048     4163   -14885     
==========================================
- Hits        17014     3418   -13596     
+ Misses       2034      745    -1289     

Flag	Coverage Δ
codegenunittests	84.90% <ø> (ø)
nidcpowersystemtests	?
nidcpowerunittests	89.53% <ø> (ø)
nidigitalsystemtests	?
nidigitalunittests	68.44% <ø> (ø)
nidmmsystemtests	?
nifakeunittests	86.01% <ø> (ø)
nifgensystemtests	?
nimodinstsystemtests	?
nimodinstunittests	94.20% <ø> (ø)
nirfsgsystemtests	?
niscopesystemtests	?
niscopeunittests	43.20% <ø> (ø)
nisesystemtests	?
niswitchsystemtests	?
nitclksystemtests	?
nitclkunittests	98.26% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.
see 48 files with indirect coverage changes

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[ni-jfitzger]

Summary
Added a new NI-DMM example.

Added a new NI-DCPower example.

Added a new NI-SWITCH example.

This contribution adheres to CONTRIBUTING.md

I've updated CHANGELOG.md.

Please stick to the pull request template.

- [ ] This contribution adheres to [CONTRIBUTING.md](https://github.com/ni/nimi-python/blob/master/CONTRIBUTING.md).
- [ ] I've updated [CHANGELOG.md](https://github.com/ni/nimi-python/blob/master/CHANGELOG.md) if applicable.
- [ ] I've added tests applicable for this pull request

Include all 3, place an X to fill in the checkbox, where appropriate, and strikethrough anything that doesn't apply.
Details about your changes can go in the "What does this Pull Request accomplish?" section.

[ni-jfitzger]

You need to run tox -e codegen to regenerate the examples documentation and then commit the change, so that Travis CI won't fail.

[bkumarng-NI]

You need to run tox -e codegen to regenerate the examples documentation and then commit the change, so that Travis CI won't fail.
I have ran tox -e codegen` and "Travis CI " is passing now. Also updated the PR details as per template. Kindly let me know if still any concerns.