The global inventory is used when launching nodes so if we want to
replace a server we have to remove it from the inventory first. This is
that step for replacing gitea01.
Note that when adding it back for the new server there are some edits to
make to the playbooks as noted in the gitea sysadmin docs.
We do also remove this instance from haproxy as well to prevent unwanted
connections while we flip things over.
Change-Id: If32405b1302353f1f262a30b7392533f86fec1e4