[device]Add check exception case when read port present fail

[jostar-yang]

- What I did
Add check exception case when read port present fail
- How I did it
Modify get_psu_presence(). Move read() and close() to "try: ... except IOError:" To avoid when read
port present sysfs fail. This exception will let sfputil.py to exit. So "sfputil show eeprom" can't show other port status.
- How to verify it
et I2C CLK/DAGA short in the board(ex:for port1). Or modify cpld drv and let port1 present sysfs to return fail. Do sfputil show eeprom in shell.
Messgse as below,
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File "/usr/share/sonic/device/x86_64-accton_as9716_32d-r0/plugins/sfputil.py", line 129, in get_presence
content = val_file.readline().rstrip()
IOError: [Errno 6] No such device or address..
Add check exception code to sfputil.py. Do the same test. Message as below,
root@sonic:/home/admin# sfputil show eeprom
Error: unable to access file: [Errno 6] No such device or address
Ethernet0: SFP EEPROM not detected
Ethernet4: SFP EEPROM not detected

Ethernet8: SFP EEPROM detected
Connector: No separable connector
Encoding: Unspecified
Extended Identifier: Power Class 1(1.5W max)
Extended RateSelect Compliance: QSFP+ Rate Select Version 1
Identifier: QSFP+ or later
Length Cable Assembly(m): 0
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