[3scale_batcher] Update regrex to match app_id with special characters

[tkan145]

What

A user reported similar error in #1453 but they have app_id with special chars instead. I also think that user with access_token will have similar problem

From the portal code, app_id allows the following:

Allowed characters: 
A-Z a-z 0-9 ! " # $ % & ' ( ) * + , - . / : ; < = > ? @ [ \ ] ^ _ ` { | } ~ # Spaces are not allowed

I'm not sure if porta ever validate access_token but from the RFC the format is as follow

b64token    = 1*( ALPHA / DIGIT /
                       "-" / "." / "_" / "~" / "+" / "/" ) *"="
credentials = "Bearer" 1*SP b64token

Verification steps

• Configure Product A with app_id/app_key both contains special characters. For example

app_id: something:special
app_key: coffee_brain_food

• Configure batcher policy for both Product A and Product B with the following:

{ "name" : "apicast.policy.3scale_batcher", "configuration" : { "batch_report_seconds" : 1 } }

• Start dev environment

make development
make dependencies

• Run apicast locally

THREESCALE_DEPLOYMENT_ENV=staging APICAST_LOG_LEVEL=debug APICAST_WORKER=1 APICAST_CONFIGURATION_LOADER=lazy APICAST_CONFIGURATION_CACHE=0 THREESCALE_PORTAL_ENDPOINT=https://token@3scale-admin.example.com ./bin/apicast

• Capture APIcast IP

APICAST_IP=$(docker inspect apicast_build_0-development-1 | yq e -P '.[0].NetworkSettings.Networks.apicast_build_0_default.IPAddress' -)

• Send a query to Product A with the valid app_id/app_key

curl -i -k -H "Host: example.com" "http://${APICAST_IP}:8080/?app_id=something:special&app_key=coffee_brain_food"

• Check that credentials not found error does not appear in the log. For example:

reports_batcher.lua:99: get_all(): failed to get report for key service_id:12,app_id:something:special,app_key:coffee_brain_food,metric:Hits err: credentials not found, context: ngx.timer, client: 10.10.10.1, server: 0.0.0.0:8080 

---

• Configure a single Product B with an OpenID Provider + realm basic
• Create 3scale application App01 for product B. That will generate Client ID and Client Secret.
• Configure batcher policy for Product B with the following:

{ "name" : "apicast.policy.3scale_batcher", "configuration" : { "batch_report_seconds" : 1 } }

• Generate token from a realm basic using client credentials from the application App01

curl -v -k -H "Content-Type: application/x-www-form-urlencoded" \
        -d 'grant_type=password' \
        -d 'client_id=${CLIENT_ID_FROM_3SCALE_APPLICATION}' \
        -d 'client_secret=${CLIENT_SECRET_FROM_3SCALE_APPLICATION}' \
        -d 'username=${USER_CREATED_IN_KEYCLOAK}' \
        -d 'password=***' "https://keycloak.example.com/auth/realms/basic/protocol/openid-connect/token"

# capture access token
ACCESS_TOKEN=eyJhb...

• Send a query to Product B with a valid access token

curl -i -k -H "Host: example.com"  -H "Authorization: Bearer ${ACCESS_TOKEN}" "http://${APICAST_IP}:8080/"

• Check that credentials not found error does not appear in the log. For example:

[eguzki]

Verification steps working
LGTM