[TC-514] ORT: Change Traffic Ops hostname in middle of ORT run

[limited]

I'm not sure if this is 2.1 specifics... Worth discussing.

• Could this prevent load balancing traffic ops from working?
• Cookies might be different (you need to sync secrets?). These are in the cdn.conf and not the database...

When you instruct the traffic_ops_ort to go to a secondary Traffic Ops, it will start on the CLI designated but will move back to the primary during the "Start processing packages" process.

Code in question : https://github.com/apache/incubator-trafficcontrol/blob/2.1.x/traffic_ops/bin/traffic_ops_ort.pl#L201

[root@edge06 ~]# /opt/ort/traffic_ops_ort.pl -dispersion=0 report DEBUG https://traffic-ops-0002.coxlab.net chs:w@term@rk
Mon Aug 14 13:29:06 UTC 2017
DEBUG OS release is EL7.
DEBUG Script running in report mode.
302
DEBUG https://traffic-ops-0002.coxlab.net/login returned HTTP 302.
DEBUG Cookie is mojolicious=eyJhdXRoX2RhdGEi4iJjaHMiLCJleHBpcmVzIjoxNTAyNzMxNzQ2fQ----136010205dc8d4951e2e2194b6b463eb3d141f1e.
DEBUG YUM_OPTS: .
DEBUG Total connections in LWP cache: 1
INFO Traffic Ops host: https://traffic-ops-0002.coxlab.net

...
INFO: ======== Start processing packages ========

DEBUG Total connections in LWP cache: 1

INFO Traffic Ops host: https://traffic-ops-0001.coxlab.net

DEBUG lwp_get called with /ort/psp6cdedge06/packages

ERROR https://traffic-ops-0001.coxlab.net/ort/edge06/packages returned HTTP 401! Unauthorized

ERROR result for https://traffic-ops-0001/ort/psp6cdedge06/packages is: ...<!--

Author: Steve Malenfant
JIRA Link: https://issues.apache.org/jira/browse/TC-514
Found Version: 2.1.0