CA-413713: Change bash-completion shortcut

[rosslagerwall]

The shortcut to show required parameters is Ctrl-rq but this conflicts with the default readline shortcut for reverse-search-history. Usually, it finds the first match but subsequent presses of Ctrl-r do not find any further matches.

Fix this by switching to Meta-q (aka Alt-q or Esc-q) which is unused.

[freddy77]

Not sure if this is documented somewhere and we should update also the documentation.

[rosslagerwall]

Not sure if this is documented somewhere and we should update also the documentation.

Not sure. It wasn't documented as part of the commit which introduced the shortcut.

[robhoes]

Ah! I noticed Ctrl-r didn't work properly, but didn't know that this was responsible... This change fixes it for me.

[edwintorok]

I didn't know we supported this.
An example command on which this work is xe vbd-create, which will print vm-uuid= device= after pressing the shortcut.
It doesn't work on xe vm-start, which does require a parameter, but there are multiple ways to specify a <vm-selector>

[last-genius]

Damn, my apologies for breaking it, thanks for the fix!

I didn't document this at the time because I couldn't come up with the best place to document autocompletion as opposed to scriptable CLI behaviour.

@edwintorok the functionality is based on parsing the help docs, which do not specify any required params:

# xe help vm-start
command name            : vm-start
        reqd params     :
        optional params : force, on, paused, <vm-selectors>