flatpak: update build-manifest to retrieve dependencies without initial download phase: - dependencies are now entirely retrieved from the installation, and requirement are build from there. The source package is currently always used, and it is now possible to use PYTHON_DEP_PREINSTALL to add extra packages or use a specific version of a package. - fixed insertion of `release_elt` for dev version at the right location. - `branch` is not set anymore for stable versions. - libxslt is not added anymore as it is part of freedesktop runtime - flathub share-modules is now used for Python 2

#!/usr/bin/env python2
# this script add aliases to /etc/hosts
import sys, re

if len(sys.argv) < 2 or len(sys.argv) > 3:
    sys.exit(1)

host = sys.argv[1]
alias = sys.argv[2] if len(sys.argv) == 3 else "localhost"

if host == "localhost" or host == alias:
    sys.exit(0)

print "Adding host {} as an alias of {}".format(host, alias)
with open("/etc/hosts", "r+") as f:
    buf = re.sub(r"\b{}\b".format(alias), "{}\t{}".format(alias, host), f.read(), 1)
    f.seek(0)
    f.write(buf)