Revert "vicadmin redirect/force TLS (#7960)"

[zjs]

Due to the potential for attacks like sslstrip, redirection from HTTP to HTTPS may be as insecure as allowing HTTP traffic in the absence of HSTS. Remove support for redirection until HSTS is supported by VIC.

Ref: https://tools.ietf.org/html/rfc6797#section-2.3.1

This reverts commit eebb2cc.

---

[specific ci=Group9-VIC-Admin]

For more information, see vmware/vic-tasks#58.

[hickeng]

@stuclem I'm unsure if this requires a documentation change - I cannot tell whether #7960 would have had doc associated with it.

[stuclem]

@hickeng if this only relates to accessing the VCH Admin portal, then I think that we're OK. We don't mention HTTP-to-HTTPS redirects in the doc:

From https://vmware.github.io/vic-product/assets/files/html/1.4/vic_vsphere_admin/access_vicadmin.html:

---

You access the VCH Admin portal in the following places:

• In the HTML5 vSphere Client, go to Home > vSphere Integrated Containers > vSphere Integrated Containers > Virtual Container Hosts and click the link to the VCH Admin portal.
• In the HTML5 vSphere Client or Flex-based vSphere Web Client, got to Hosts and Clusters, select a VCH endpoint VM, and click the link to the VCH Admin portal in the Summary tab.
• Copy the address of the VCH Admin portal from the output of vic-machine create or vic-machine inspect.

---