[pve-devel] [trivial] reword task description of HA controlled CT/VM API calls

[Thomas Lamprecht]

On CT/VM {migrate,start,stop,shutdown} use "Requesting" instead of
"Executing".
This should make it clear that we currently do not actually anything (i.e
execute) but ask the HA stack to bring the service in the respective state
(i.e. requesting).

The HA stack may need some time (LRM could be idle, for example) to actually
execute this task and some user where a bit confused as it seemed than
nothing happened, even if the task was shown as executed.
This change should clarify a bit more that only a request was made.