[doc] Add support status of resources in README

Split network resources into fixed and floating IPs.
Namespaces in setup
Add support to restore hashes of users' passwords
Disassociate a network before delete it
Retrieve built-in roles
Fixed reinitialization of the mapping
Added support of cleaning users, roles and tenants
Ensure that tenants are proprely migrated
Migration hashes of users' password
Switched to subparses
Description of migration strategies and path for instances
[doc] Add migration strategies summary to RESOURCES document
Add parameter to migrate hosts to the list of resources

This will allow to specify 'hosts' as a resource type in cli.
Add functions to match the parameter.
Implement migrate_host() function

This function filters a list of servers from all tenants by the
hostname of target host and triggers migration for every found
server.
Allow migration of individual resources

If resource ID provided in CLI, pass it to migration command,
otherwise run bulk migration command
Add bulk migration command for all hypervisor hosts.
Implement migration of resources from host identified by hostname
Remove deployment-specific configuration files
Add script to migrate host from source to target cloud

Add script scripts/migrate_host.py that reads configuration file
for the hardware environment and uses IPMI protocol to decomission
the host specified as an argument in the command line.
Add script to migrate host from source to target cloud

Add script scripts/migrate_host.py that reads configuration file
for the hardware environment and uses IPMI protocol to decomission
the host specified as an argument in the command line.
Add description of migrate_host.py script to README