Update old driver notebooks (Agilent 34400A)

[Akshita07]

Fixes legacy code use in old example driver notebooks.

Changes proposed in this pull request:

• Remove Loop usage in Agilent 34400A notebook
• Use get_idn method for getting information in Oxford Triton notebook

To do:

• Test Agilent 34400A notebook with instrument

[codecov]

Codecov Report

Merging #2377 (0c9b6c9) into master (f688fe3) will not change coverage.
The diff coverage is n/a.

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  Coverage   65.36%   65.36%           
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  Files         207      207           
  Lines       27978    27978           
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  Hits        18288    18288           
  Misses       9690     9690           

[jenshnielsen]

For the Agilent 34400A notebook I think we should:

• Get rid of that Timer class. It does not really have anything to do with this instrument and just creates more confusion.
• Only create one station.
• Write a bit of text explaining what we are doing.

[astafan8]

Great work on the diagram and the explanations!