[DellEMC] s5232f console and sfputil fix

[srideepDell]

Remove hardcoding 115K baudrate for console
Sync sfputil.py from master to 201911 branch

- What I did

Remove hardcoding 115K baudrate for console
Enhance sfputil api as per spec

- How I did it
Modifying platform related files for S5232 under device folder.

- How to verify it
Did verify on S5232 platform

- Description for the changelog

- A picture of a cute animal (not mandatory but encouraged)

[srideepDell]

Logs
System booted on 9600 console
SFP logs

sfputil show presence | more
Port Presence

---

Ethernet0 Present
Ethernet4 Present
Ethernet8 Present
Ethernet12 Present
Ethernet16 Not present

show interfaces transceiver eeprom | more
Ethernet0: SFP EEPROM detected
Connector: MPOx12
Encoding: 64B66B
Extended Identifier: Power Class 4(3.5W max), CDR present in Rx Tx
Extended RateSelect Compliance: QSFP+ Rate Select Version 1
Identifier: QSFP28 or later
Length Cable Assembly(m): 150
Nominal Bit Rate(100Mbs): 255
Specification compliance:
Vendor Date Code(YYYY-MM-DD Lot): 2019-04-25
Vendor Name: DELL
Vendor OUI: 00-17-6a
Vendor PN: 14NV5
Vendor Rev: A0
Vendor SN: CN07919294P05AM

[lgtm-com]

This pull request introduces 1 alert when merging 230995c into 898f878 - view on LGTM.com

new alerts:

• 1 for Unused import

[srideepDell]

retest broadcom please