pom.xml: Remove <distributionManagement>, use settings.xml from CI
pom.xml: Remove <distributionManagement>, use settings.xml from CI

Not all Kurento pom.xml can be children of  kurento-parent-pom to
inherit a common <distributionManagement>. For example, all module
generated poms (kms-api-core, kms-api-elements, kms-api-filters) must be
independent, and the same happens with kurento-qa-pom or
kurento-maven-plugin.

Instead of having to copy the <distributionManagement> section all over,
no such section is defined at all, and CI injects equivalent properties
with its settings.xml at build time.

Kurento/kurento-qa-pom