utils: reverse ip addresses of a nic returned by java to get the first ip address

[ustcweizhou]

Description

Java methods getInterfaceAddresses() returns ip addresses in reverse order as "ip addr show"
If there are multiple IPs assigned to a management interface, the last ip will be used as management ip in cloudstack. We need to reverse the ip addresses to get the first ip that makes more sense.

Fixes: #3311

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)

How Has This Been Tested?

Add a secondary ip to management interface in kvm hypervisor, and restart cloudstack-agent
In the past the hypervisor will use the new ip in cloudstack database.
If the new ip does not work, we are not able to access the console of vm on the hypervisor.

With this change, the ip in database will not be changed. cloudstack will still use primary ip.

[rohityadavcloud]

@blueorangutan package

[blueorangutan]

@rhtyd a Jenkins job has been kicked to build packages. I'll keep you posted as I make progress.

[blueorangutan]

Packaging result: ✔centos6 ✔centos7 ✔debian. JID-70

[rohityadavcloud]

@blueorangutan test

[blueorangutan]

@rhtyd a Trillian-Jenkins test job (centos7 mgmt + kvm-centos7) has been kicked to run smoke tests

[blueorangutan]

Trillian test result (tid-80)
Environment: kvm-centos7 (x2), Advanced Networking with Mgmt server 7
Total time taken: 26112 seconds
Marvin logs: https://github.com/blueorangutan/acs-prs/releases/download/trillian/pr3449-t80-kvm-centos7.zip
Smoke tests completed. 71 look OK, 0 have error(s)
Only failed tests results shown below:

Test	Result	Time (s)	Test File

[rohityadavcloud]

Can you review @anuragaw @shwstppr

[shwstppr]

LGTM on code

[anuragaw]

LGTM