Fix KeyError: 'members' for test_inner_hashing

[JibinBao]

Description of PR

KeyError: 'members' is introduced by this PR sonic-net/sonic-buildimage#13660.
In original config, we use PORTCHANNEL, now it is changed to PORTCHANNEL_MEMBER. So, the relevant test should be updated accordingly.

Test log:

oports = []
for ifname in ifnames:
if po.has_key(ifname):
oports.append([str(mg_facts['minigraph_ptf_indices'][x]) for x in po[ifname]['members']])
E KeyError: 'members'

Summary:
Fixes # (issue)

Type of change

• Bug fix
• Testbed and Framework(new/improvement)
• Test case(new/improvement)

Back port request

• 201911
• 202012
• 202205

Approach

What is the motivation for this PR?

Fix test_inner_harhing issue

How did you do it?

PORTCHANNEL is changed to PORTCHANNEL_MEMBER

How did you verify/test it?

Run test_inner_hashing

Any platform specific information?

Any

Supported testbed topology if it's a new test case?

Documentation

[JibinBao]

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