build-and-provide-package: fix trunk_release if SKIP_REPREPRO_WRAPPER
build-and-provide-package: fix trunk_release if SKIP_REPREPRO_WRAPPER

* fix 42a7ea8f947
* get_arch_changes() to get file expansion for reprepro cmdline
  remove copy&paste and do not use architecture var

trunk_release is copying packages from $REPOS to $TRUNK_RELEASE,
if we have SKIP_REPREPRO_WRAPPER defined the packages are not
installed in $REPOS so $TRUNK_RELEASE will not receive the new
packages

mika/jenkins-debian-glue,wikimedia/operations-debs-jenkins-debian-glue,kartikm/jenkins-debian-glue,wikimedia/operations-debs-jenkins-debian-glue,linuxmaniac/jenkins-debian-glue,kartikm/jenkins-debian-glue,hashar/jenkins-debian-glue,mika/jenkins-debian-glue,linuxmaniac/jenkins-debian-glue,hashar/jenkins-debian-glue