Remove DRb debug code

[agrare]

With the DRb connection issues resolved we can remove the extra checks which were added to help find the issue.

These were:

• Add client side DrbMessage#load checks #20 - Add client side DrbMessage#load checks
• Add marshal version and DRb message size checks #17 - Add marshal version and DRb message size checks

Depends:

• Close open connections from parent after fork manageiq#16953

[miq-bot]

Checked commits agrare/vmware_web_service@ea36eac~...c63984f with ruby 2.3.3, rubocop 0.52.0, haml-lint 0.20.0, and yamllint 1.10.0
2 files checked, 0 offenses detected
Everything looks fine. 🍪

[agrare]

cc @Fryguy

[simaishi]

Fine backport (to manageiq-gems-pending) details:

$ git log -1
commit 24013eea31b69245453187bd392a0b7a10456008
Author: Jason Frey <fryguy9@gmail.com>
Date:   Tue Mar 13 13:26:03 2018 -0400

    Merge pull request #33 from agrare/remove_drb_debug_code
    
    Remove DRb debug code
    (cherry picked from commit c0ea9b58a118aef57878745ed9479e16d115b4a4)
    
    Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1572719

[simaishi]

@miq-bot add_label fine/backported