[sr-dev] [kamailio/kamailio] Branch ordering behavior changed between v5.3 and v5.4 (#2449)

[Cindy Leung]

So I applied Victor's `route[TEST]` at the beginning of my config and added the usrloc entries.  The problem with branches could not be reproduced.  Instead of `drop` at the end of `route[TEST]`, I `revert_uri()` so I could continue with my `append_branch` portion.  Same result.  Here's the log (DEBUG=2).

```
ERROR: sipp-ci1-20200827020223-1-21 at 172.19.1.21: Entering test route
ERROR: sipp-ci1-20200827020223-1-21 at 172.19.1.21: ==== $ru:sip:alice5 at 127.0.0.5:5085
ERROR: sipp-ci1-20200827020223-1-21 at 172.19.1.21: === $branch 0: uri:sip:alice4 at 127.0.0.4:5084, q:400
ERROR: sipp-ci1-20200827020223-1-21 at 172.19.1.21: === $branch 1: uri:sip:alice3 at 127.0.0.3:5083, q:300
ERROR: sipp-ci1-20200827020223-1-21 at 172.19.1.21: === $branch 2: uri:sip:alice2 at 127.0.0.2:5082, q:200
ERROR: sipp-ci1-20200827020223-1-21 at 172.19.1.21: === $branch 3: uri:sip:alice1 at 127.0.0.1:5081, q:100
ERROR: sipp-ci1-20200827020223-1-21 at 172.19.1.21: === $branch 4: uri:<null>, q:<null>
ERROR: sipp-ci1-20200827020223-1-21 at 172.19.1.21: ==== $ru:sip:alice5 at 127.0.0.5:5085
ERROR: sipp-ci1-20200827020223-1-21 at 172.19.1.21: ==== $ru:sip:alice4 at 127.0.0.4:5084
ERROR: sipp-ci1-20200827020223-1-21 at 172.19.1.21: ==== $ru:sip:alice3 at 127.0.0.3:5083
ERROR: sipp-ci1-20200827020223-1-21 at 172.19.1.21: ==== $ru:sip:alice2 at 127.0.0.2:5082
ERROR: sipp-ci1-20200827020223-1-21 at 172.19.1.21: ==== $ru:sip:alice1 at 127.0.0.1:5081
ERROR: sipp-ci1-20200827020223-1-21 at 172.19.1.21: Starting append_branch() sequence
ERROR: sipp-ci1-20200827020223-1-21 at 172.19.1.21: === sip:1001 at gateway1.carrierB.com;transport=tcp, 300
ERROR: sipp-ci1-20200827020223-1-21 at 172.19.1.21: === sip:1001 at gateway2.carrierB.com;transport=tcp, 200
ERROR: sipp-ci1-20200827020223-1-21 at 172.19.1.21: === sip:1001 at gateway3.carrierB.com;transport=tcp, 700
ERROR: sipp-ci1-20200827020223-1-21 at 172.19.1.21: === sip:1001 at gateway4.carrierB.com;transport=tcp, 500
ERROR: sipp-ci1-20200827020223-1-21 at 172.19.1.21: === sip:1001 at gateway5.carrierB.com;transport=tcp, 600
ERROR: sipp-ci1-20200827020223-1-21 at 172.19.1.21: Starting t_next_contacts
ERROR: sipp-ci1-20200827020223-1-21 at 172.19.1.21: ==== sip:alice at carrierB
ERROR: sipp-ci1-20200827020223-1-21 at 172.19.1.21: ==== sip:1001 at gateway5.carrierB.com;transport=tcp
ERROR: sipp-ci1-20200827020223-1-21 at 172.19.1.21: ==== sip:1001 at gateway4.carrierB.com;transport=tcp
ERROR: sipp-ci1-20200827020223-1-21 at 172.19.1.21: ==== sip:1001 at gateway1.carrierB.com;transport=tcp
ERROR: sipp-ci1-20200827020223-1-21 at 172.19.1.21: ==== sip:1001 at gateway2.carrierB.com;transport=tcp
```



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