infra/perl: switch to using a reliable mirror

The mirror we currently use is not a mirror, it's the main archive.

It has a few shortcomings:
  - it might not contain all the versions of the modules we use,
  - it can be unavailable at times (like now, for example)

Switch to using a realmirror, that:
  - does a round-robin on the actual mirror, so availability is better
  - contains all versions of all modules (yes, mojolicious is there!)

As a consequence, switch mojolicious to use our standard mirror,

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: François Perrad <francois.perrad@gadz.org>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Try-Tiny: new package
Plack: all packages
moo: all packages
dancer2: all packages

TT: PERL_TEMPLATE_TOOLKIT_CONF_OPT = "TT_XS_ENABLE=n"
network interface eth0
defconfig
demo

set BR2_ROOTFS_OVERLAY with $(BR2_EXTERNAL)/overlay/
dancer2 skeleton

$ dancer2 gen -a MyWeb::App
Dancer2 as service
BR demo
add DateTime
add Chart-Plot-Tagged
add ntp in defconfig
update plot
user guest