Revert "stop using x509ignoreCN=0 for routing release"

This reverts commits:
- 78a5621
- 360c820
- 0056bc3

Co-authored-by: Renee Chu <[email protected]>

[#175826416](https://www.pivotaltracker.com/story/show/175826416)

Author: jrussett

docs/golang1.15-remove-x509ignoreCN=0-flag-certificates-now-require-SANs.md

@@ -8,7 +8,7 @@ processes:
   limits:
     open_files: 100000
   env:
-    GODEBUG: netdns=cgo
+    GODEBUG: netdns=cgo,x509ignoreCN=0
   hooks:
     pre_start: /var/vcap/jobs/gorouter/bin/bpm-pre-start
   capabilities:

jobs/gorouter/templates/bpm.yml.erb

@@ -1,6 +1,8 @@
 processes:
   - name: route_registrar
     executable: /var/vcap/packages/route_registrar/bin/route-registrar
+    env:
+      GODEBUG: x509ignoreCN=0
     args:
     - --configPath
     - /var/vcap/jobs/route_registrar/config/registrar_settings.json

jobs/route_registrar/templates/bpm.yml.erb

@@ -1,6 +1,8 @@
 processes:
   - name: routing-api
     executable: /var/vcap/packages/routing-api/bin/routing-api
+    env:
+      GODEBUG: x509ignoreCN=0
     args:
     - -config
     - /var/vcap/jobs/routing-api/config/routing-api.yml

jobs/routing-api/templates/bpm.yml.erb

@@ -10,3 +10,5 @@ processes:
   - NET_BIND_SERVICE
   - SYS_RESOURCE
   executable: /var/vcap/jobs/tcp_router/bin/tcp_router_ctl
+  env:
+    GODEBUG: x509ignoreCN=0