Fix HTTP/2 issue with PCF

Issue

When using HTTP/2, the PCF sends the location header in lower-case, which is not matched.

Fix

Make the location header case-insensitive

added Fix v1.5.1 labels

requested review from @defosseu

assigned to @defosseu

@phine_stefan thx

Once I got the image built, I will test it.

mentioned in merge request oai-cn5g-fed!115 (merged)

All HTTP/2 tutorials are passing:

https://jenkins-oai.eurecom.fr/view/CN5G/job/OAI-CN5G-Tutorials-Check-Dev-selfix/27/

OAI OAI-CN5G-SMF build (537): passed (https://jenkins-oai.eurecom.fr/job/OAI-CN5G-SMF/537/)

approved this merge request

mentioned in commit 1db0f8ce

merged