Add Juniper EX4100 device types modified from EX3400 models (#1310)

* Add Juniper EX4100 device types modified from EX3400 models

* Fix et-0/1/* numbering error

* model EX4100 Power Supply and Fan module bays and module types

* fix string validation for module bay positions

* Update EX4100-48T.yaml

* Update EX4100-48P.yaml

* Update EX4100-24T.yaml

* Update EX4100-24P.yaml

* Update EX4100-24P.yaml

* Update EX4100-24T.yaml

* Update EX4100-48P.yaml

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Co-authored-by: Daniel W. Anner <daniel.anner@danstechsupport.com>