post_build_checks still looking for a splunk instance.

[TheRealFawby]

• Operating System Version: Win10
• Provider (VirtualBox/VMWare): VirtualBox
• Vagrant Version: 2.2.18
• Packer Version: 1.7.7
• Are you using stock boxes (downloaded) or were they built from scratch using Packer? Scratch with Packer.
• Is the issue reproducible or intermittent? Yes

Please verify that you are building from an updated Master branch before filing an issue.

Description of the issue:

post_build_checks() in build.ps1 script is still checking for a Splunk instance, instead of ELK.

[post_build_checks] Running Splunk Check.
[download] Running for https://192.168.38.105:8000/en-US/account/login?return_to=%2Fen-US%2F, looking for This browser is not supported by Splunk
Error occured on webrequest: Exception calling "DownloadString" with "1" argument(s): "Unable to connect to the remote server"
[post_build_checks] Splunk Result: False