Fix network GC error that's failing a smoketests on master

[yadvr]

This PR attempts to fix various test failures on master:

1. Fixes Network GC error on master/4.12 #2935: This fixes the variable name to adhere to the DB framework convention
   as defined by the method interceptor that creates attributes:

https://github.com/apache/cloudstack/blob/master/framework/db/src/main/java/com/cloud/utils/db/SearchBase.java#L480

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)

[GabrielBrascher]

LGTM

[yadvr]

@rafaelweingartner @GabrielBrascher guys this is still in progress, unfortunately, I'm unable to work on stabilizing failing master smoketests this week, I'll try next week. I think there are a few in Travis+{smoke, component}-tests and few on Trillian+smoketests. If you've time, please feel free to fix and push changes to the branch (acs committers can do that on any PRs).

[rafaelweingartner]

Ah, so you are not targeting a single problem. Thanks for the first fix.

[GabrielBrascher]

I also thought it was targeting a single problem; I saw that it fixed some tests and imagined it was all good to go. Thanks for the effort @rhtyd!

[yadvr]

I'm not sure when I'll be able to fix other issues, I'll proceed with merging this based on Travis smoketests that at least fix the network gc error.

[rafaelweingartner]

Thanks @rhtyd. Gabriel and I are actually working on the other issues already. I decided to open a PR per issue, because I think that it gets easier to review and to discuss them.

Thanks for this one ;)

[yadvr]

Thanks @rafaelweingartner, yes I saw some PRs.