Revert "use landing base route path to construct endpoints"

Summary:
This reverts commit 02dc417d09f4d7d288e42f1a3900a6a836460821.

Depends on D3549

Test Plan: This is just a revert. The following diffs were tested

Reviewers: varun, atul, palys-swm

Reviewed By: varun

Subscribers: Adrian, karol-bisztyga, benschac, yayabosh

Differential Revision: https://phabricator.ashoat.com/D3550