vagrant: initial implementation

This feature adds initial vagrant-compatible box
build support as outlined in #28553.

features.in/vagrant/README

@@ -0,0 +1,11 @@
+Эта фича обеспечивает специфичную для vagrant предварительную
+настройку образа файловой системы виртуальной машины.
+
+Обратите внимание, что специфика включает широко известные:
+- пароли root и пользователя vagrant с беспарольным sudo;
+- "секретный" ключ от публичной части у пользователя vagrant.
+
+См. тж.:
+http://bugzilla.altlinux.org/28553
+http://docs.vagrantup.com/v2/boxes/base.html
+http://williamwalker.me/blog/creating-a-custom-vagrant-box.html

features.in/vagrant/authorized_keys

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+ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA6NF8iallvQVp22WDkTkyrtvp9eWW6A8YVr+kz4TjGYe7gHzIw+niNltGEFHzD8+v1I2YJ6oXevct1YeS0o9HZyN1Q9qgCgzUFtdOKLv6IedplqoPkcmF0aYet2PkEDo3MlTBckFXPITAMzF8dJSIFo9D8HfdOV0IAdx4O7PtixWKn5y2hMNG0zQPyUecp4pzC6kivAIhyfHilFR61RGL+GPXQ2MWZWFYbAGjyiYJnAmCP3NOTd0jMZEnDkbUvxhMmBYSdETk1rRgm+R4LOzFUGaHqHDLKLX+FIPKcF96hrucXzcWyLbIbEgE98OHlnVYCzRdK8jlqm8tehUc9c9WhQ== vagrant insecure public key

features.in/vagrant/config.mk

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+use/vagrant: use/vmguest/vbox use/deflogin use/net-ssh use/control
+	@$(call add_feature)
+	@$(call add,THE_PACKAGES,sudo)
+	@$(call add,CONTROL,sudo:public)
+	@$(call add,USERS,vagrant:vagrant:1:)	# NB: custom sudoers
+	@$(call set,ROOTPW,vagrant)

features.in/vagrant/rootfs/image-scripts.d/50-vagrant

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+#!/bin/sh
+# NB: 50-vargant > 50-users (so homedir exists already)
+
+echo "UseDNS no" >> /etc/openssh/sshd_config
+
+# https://raw.github.com/mitchellh/vagrant/master/keys/vagrant.pub
+pubkey="ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA6NF8iallvQVp22WDkTkyrtvp9eWW6A8YVr+kz4TjGYe7gHzIw+niNltGEFHzD8+v1I2YJ6oXevct1YeS0o9HZyN1Q9qgCgzUFtdOKLv6IedplqoPkcmF0aYet2PkEDo3MlTBckFXPITAMzF8dJSIFo9D8HfdOV0IAdx4O7PtixWKn5y2hMNG0zQPyUecp4pzC6kivAIhyfHilFR61RGL+GPXQ2MWZWFYbAGjyiYJnAmCP3NOTd0jMZEnDkbUvxhMmBYSdETk1rRgm+R4LOzFUGaHqHDLKLX+FIPKcF96hrucXzcWyLbIbEgE98OHlnVYCzRdK8jlqm8tehUc9c9WhQ== vagrant insecure public key"
+sshkeys=~vagrant/.ssh/authorized_keys
+install -pDm400 -o vagrant -g vagrant /dev/null "$sshkeys"
+echo "$pubkey" > "$sshkeys"
+
+sudocfg=/etc/sudoers.d/vagrant
+install -pDm400 /dev/null "$sudocfg"
+cat > "$sudocfg" << EOF
+Defaults:vagrant  !requiretty
+vagrant ALL=(ALL) NOPASSWD:ALL
+EOF
+
+mkdir -p /vagrant