Update XenServer and KVM hosts password

Motivation

The existing updateHostPassword API call would allow only database changes, which means that the passwords would have to be updated manually in all the hosts. in addition, the API was only available for XenServer based hosts. The lack of functionality, which leads to manual, or not standardised, work and the limitations of the API urged us to apply some changes in order to improve its current behaviour.

With the improvements applied we will be able to:

Update the XenServer and KVM hosts password on the DB only
Update the XenServer hosts and KVM password on the DB and hosts themselves

XenServer hosts can only be updated if the Cluster ID is informed. An attempt to update a XenServer hosts alone will result in the following error:

Single host update is not supported by XenServer hypervisors. Please try again informing the Cluster ID.

API Changes

Although the API has changed, we kept backwards compatibility by adding only a parameter to which the operator will either say "true" or "false". In case the operator wants to work as before, by updating the hosts passwords manually, the parameter "update_passwd_on_host" has "false" as default value, so the operator doesn't need to inform it.

Updating hosts - DB only

The cloudmonkey calls below can be used for both XenServer and KVM hosts.

XenServer Cluster

update hostpassword clusterid=53963278-f9d1-42d5-bab5-18c7ec466a0b username=root password=admin123

KVM single host

update hostpassword hostid=9ae1d93b-d09c-4e1c-94fa-9082e81cca26 username=root password=admin123

KVM Cluster

update hostpassword clusterid=53963278-f9d1-42d5-bab5-18c7ec466a0b username=root password=admin123

Updating hosts - DB and Hosts