[VDSM] Build fail with "Curl error (28): Timeout was reached for..."

Looks like creating mock env fail because of slow network. Can we have local mirror to avoid such issues? Error: # /usr/bin/dnf --installroot /var/lib/mock/fedora-28-x86_64-4a1ad1766b02e7fc37cf465ffb164e2f-15798/root/ --releasever 28 --disableplugin=local --setopt=deltarpm=False install @buildsys-build autoconf automake createrepo dnf dnf-utils gdb git iproute-tc libguestfs-tools-c libselinux-python3 libvirt-python3 lshw make mom openvswitch ovirt-imageio-common policycoreutils-python python2-augeas python2-blivet1 python2-coverage python2-dateutil python2-dbus python2-decorator python2-devel python2-dmidecode python2-enum34 python2-inotify python2-ioprocess python2-ipaddress python2-magic python2-mock python2-netaddr python2-pthreading python2-pyudev python2-pyyaml python2-requests python2-setuptools python2-six python2-subprocess32 python3-PyYAML python3-augeas python3-coverage python3-dateutil python3-dbus python3-decorator python3-devel python3-magic python3-netaddr python3-nose python3-pyudev python3-six python3-yaml rpm-build ... Transaction Summary ================================================================================ Install 675 Packages Total download size: 424 M Installed size: 1.5 G Downloading Packages: ... (530/675): rest-0.8.1-2.fc28.x86_64.rpm 211 kB/s | 69 kB 00:00 (531/675): libXau-1.0.8-11.fc28.x86_64.rpm 193 kB/s | 34 kB 00:00 (532/675): libogg-1.3.2-10.fc28.x86_64.rpm 147 kB/s | 30 kB 00:00 [MIRROR] gtk3-3.22.30-1.fc28.x86_64.rpm: Curl error (28): Timeout was reached for http://mirrors.phx.ovirt.org/repos/yum/fedora-base-fc28/base/Packages/g/g... [Operation too slow. Less than 1000 bytes/sec transferred the last 30 seconds] [FAILED] gtk3-3.22.30-1.fc28.x86_64.rpm: Curl error (28): Timeout was reached for http://mirrors.phx.ovirt.org/repos/yum/fedora-base-fc28/base/Packages/g/g... [Operation too slow. Less than 1000 bytes/sec transferred the last 30 seconds] Error: Error downloading packages: Curl error (28): Timeout was reached for http://mirrors.phx.ovirt.org/repos/yum/fedora-base-fc28/base/Packages/g/g... [Operation too slow. Less than 1000 bytes/sec transferred the last 30 seconds] Build: https://jenkins.ovirt.org/blue/rest/organizations/jenkins/pipelines/vdsm_...