Remove the ban of using p4d as head node

[hanwen-pcluste]

Signed-off-by: Hanwen hanwenli@amazon.com

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

The change is verified by the following tests:

test-suites:
  multiple_nics:
    test_multiple_nics.py::test_multiple_nics:
      dimensions:
        - regions: {{ regions }}
          instances: {{ instances }}
          oss: {{ common.OSS_COMMERCIAL_X86 }}
          schedulers: ["slurm"]

[codecov]

Codecov Report

Merging #2308 (7cdbeb6) into develop (f60491d) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #2308      +/-   ##
===========================================
- Coverage    61.67%   61.63%   -0.05%     
===========================================
  Files           40       40              
  Lines         6156     6156              
===========================================
- Hits          3797     3794       -3     
- Misses        2359     2362       +3     

Impacted Files	Coverage Δ
cli/src/pcluster/config/validators.py	88.41% <100.00%> (-0.13%)	⬇️
cli/src/pcluster/configure/easyconfig.py	86.60% <0.00%> (-0.96%)	⬇️

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