cloudutils: use "ip route" command instead of "route -n" in networkConfig.py

[weizhouapache]

Description

This PR uses 'ip route' command instead of 'route -n' command in networkConfig.py

route is provided by legacy net-tools package which is not installed by default in some distributions
ip is provided by iproute2 package which is a dependency of cloudstack-agent package

the two commands have the same result

# route -n|awk '/^0.0.0.0/ {print $2,$8}'
10.0.32.1 cloudbr0

# ip route show default | awk '{print $3,$5}'
10.0.32.1 cloudbr0

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)
• build/CI
• test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

• Major
• Minor

Bug Severity

• BLOCKER
• Critical
• Major
• Minor
• Trivial

Screenshots (if appropriate):

How Has This Been Tested?

How did you try to break this feature and the system with this change?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 15.17%. Comparing base (f13cf59) to head (58a723a).
Report is 16 commits behind head on 4.19.

Additional details and impacted files

@@             Coverage Diff              @@
##               4.19   #10726      +/-   ##
============================================
- Coverage     15.17%   15.17%   -0.01%     
  Complexity    11332    11332              
============================================
  Files          5415     5415              
  Lines        474893   474893              
  Branches      57920    57920              
============================================
- Hits          72046    72042       -4     
- Misses       394792   394796       +4     
  Partials       8055     8055              

Flag	Coverage Δ
uitests	4.28% <ø> (ø)
unittests	15.89% <ø> (-0.01%)	⬇️

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[weizhouapache]

@blueorangutan package

[blueorangutan]

@weizhouapache a [SL] Jenkins job has been kicked to build packages. It will be bundled with KVM, XenServer and VMware SystemVM templates. I'll keep you posted as I make progress.

[DaanHoogland]

clgtm

[blueorangutan]

Packaging result [SF]: ✔️ el8 ✔️ el9 ✔️ debian ✔️ suse15. SL-JID 13062

[rohityadavcloud]

@blueorangutan test

[blueorangutan]

@rohityadavcloud a [SL] Trillian-Jenkins test job (ol8 mgmt + kvm-ol8) has been kicked to run smoke tests

[blueorangutan]

[SF] Trillian test result (tid-13035)
Environment: kvm-ol8 (x2), Advanced Networking with Mgmt server ol8
Total time taken: 49494 seconds
Marvin logs: https://github.com/blueorangutan/acs-prs/releases/download/trillian/pr10726-t13035-kvm-ol8.zip
Smoke tests completed. 132 look OK, 1 have errors, 0 did not run
Only failed and skipped tests results shown below:

Test	Result	Time (s)	Test File
test_03_secured_to_nonsecured_vm_migration	Error	397.84	test_vm_life_cycle.py