Implement Keysight N1914a plugin.

N1914a is a power meter with SCPI interface. The implementation of
the plugin is referenced by the Keysight official document:
N1913A/N1914A EPM series Power Meter Programming Guide.

BUG=b:27818897
TEST=manually

Change-Id: Ia40db44bc22ad169f8578a56c4e61159eb72a333
4 files changed
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