Admin interface on ZOS

[rawdaGastan]

Related to

• https://git.ourworld.tf/tfgrid/circle_engineering/issues/130

Should allow

• rebooting the node
• restart specific zinit service
• restart all zinit services
• stopping specific workload
• show logs of X lines of zinit service
• show /etc/resolve
• show open connections with rpc

[Eslam-Nawara]

I discussed with sameh the possibility of querying the open connections to the rpc nodes and it won't be straight forward as more than one service can be running on the same machine with the same ip so instead we can try to list all the open connections and we can use this info to identify what nodes create more connections than they should.

[Eslam-Nawara]

WIP

• added all requested endpoints
• added example to all endpoints to node client
• added docs of all endpoints to the api manual

[Eslam-Nawara]

WIP
Tried testing the pr, but had a problem testing both restart and restart_all endpoints as the nodes are currently running zinit v0.2.11 and the restart feature of zinit is added in v0.2.13 so was trying to update zinit version and building a local zos image to test it before updating zinit.