[CLI] Move hostname, mgmt interface/vrf config to hostcfgd

[fastiuk]

This PR depends on sonic-net/sonic-utilities#2173

Why I did it

To be able to configure the management interface and hostname standalone by changing database config at runtime.
From the CLI perspective fo view, the following behavior is the same. But now you have two ways of configuring it: CLI, directly through the database.

How I did it

Moved configuration part of the interface and hostname to "hostcfgd".

How to verify it

• Built an image
• Flash it to the switch
• Run CLI commands

# Set IP address: verify address is set on the iface
sudo config interface ip add eth0 10.210.25.127/22 10.210.24.1
ip address show eth0
# 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
#     link/ether 98:03:9b:a2:be:80 brd ff:ff:ff:ff:ff:ff
#     inet 10.210.25.127/22 brd 10.210.27.255 scope global eth0
#        valid_lft forever preferred_lft forever
#     inet6 fe80::9a03:9bff:fea2:be80/64 scope link
#       valid_lft forever preferred_lft forever

# Remove IP address: verify you received address form DHCP
sudo config interface ip remove eth0 10.210.25.127/22
ip address show eth0
# 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
#     link/ether 98:03:9b:a2:be:80 brd ff:ff:ff:ff:ff:ff
#     inet 10.210.25.127/22 brd 10.210.27.255 scope global eth0
#        valid_lft forever preferred_lft forever
#     inet6 fe80::9a03:9bff:fea2:be80/64 scope link
#       valid_lft forever preferred_lft forever

# Enable/disable mgmt VRF
ip address show mgmt
# Device "mgmt" does not exist.

sudo config vrf add mgmt
ip address show mgmt
# 72: mgmt: <NOARP,MASTER,UP,LOWER_UP> mtu 65575 qdisc noqueue state UP group default qlen 1000
#     link/ether fa:9b:ad:7b:1e:83 brd ff:ff:ff:ff:ff:ff

sudo config vrf del mgmt
ip address show mgmt
# Device "mgmt" does not exist.

# Setting the hostname
admin@r-anaconda-27:~$ sudo config hostname bla
# Login / Logout
admin@bla:~$

Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012
• 202106
• 202111

Description for the changelog

• Moved management interface configuration to hostcfgd.
• Moved management VRF configuration to hostcfgd.
• Moved hostname configuration to hostcfgd.

Submodules PR's :

Repo	PR title	State
sonic-utilities	[CLI] Move hostname, mgmt interface/vrf config to hostcfgd

A picture of a cute animal (not mandatory but encouraged)

[ghost]

All CLA requirements met.

[liat-grozovik]

@fastiuk coulld you please edit the PR subject? can you make it clea what is moved? also please note that chnages under sonic-utilities should be placed as a PR aginst sonic-utiltiies repro and once merged you can have submoudle update PR on sonib-buildimage. If there is a dependcy on the PRs please add it to the description

[dgsudharsan]

Please add UT for mgmt interface/vrf

[liat-grozovik]

@fastiuk when do you think the UT can be added so hthis change can get in?

[fastiuk]

@fastiuk when do you think the UT can be added so hthis change can get in?

Done

[fastiuk]

@liat-grozovik By the way, since this MR depends on sonic-utilities, should it contain a submodule commit or I will need to update it later in the same way as without dependency?

[liat-grozovik]

@lguohan could you please help to review or assing someone to do so?

[fastiuk]

I think conflicts can't be resolved here anymore, cause the code was moved to the submodule.
Here is a new PR, I will close this one.
sonic-net/sonic-host-services#2