feature #1793: change the VR scripts to alpinelinux
(cherry picked from commit 4a39b2ef837cc9580d52a91e364fd60ddb86ec9a)
feature #1793: Return the extended template in the CONTEXT section for the vnet attribute(cherry picked from commit 00db2ee6151334873c45a4430b0647a7fa4f9b19)
feature #1793: Don't serve the USED leases in the VR's dhcp.(cherry picked from commit e4d3eef2713238decc6bd517b01d922fe521ed84)
feature #1793: Fix the FORWARDING attribute(cherry picked from commit c223198342ca8ba3c35a8088706d3300eb85c547)
feature #1793: Enable RADVD and ipv6 in the VR(cherry picked from commit d8e92d49260dd85e2c1148b916361d79bbc48767)
feature #1793: Proper handling of IPv6 prefixes in the core(cherry picked from commit 9a41ccb3343789b18ec378fe003cc4e8d02e3453)
feature #1793: The root password should be encrypted(cherry picked from commit ee2b86ac747a046c5bfef7a5b099c3d72ce08072)
feature #1793: Add parsers
(cherry picked from commit 028c529631e55a0f3eba112901acf5c57ceeb030)