Fix copy/paste errors in print messages

"Aggregate %s has been successfully updated." as the print message of
do_aggregate_set_metadata/do_aggregate_add_host/do_aggregate_remove_host
is incorrect.

Change-Id: I18c1c3a4403a8ebe3062ef7a695b0e643619dc74
Fix spelling miss of password_func variable

In novaclient/shell.py there is a variable called 'password_fun'
which isn't used anywhere.
In fact it's a spelling miss, and should be modified to 'password_func'
which is used in novaclient/client.py
This patch fixes this bug.

Change-Id: Ibb8e95a2efc77575dcc8544584c708c5c62b7dea
Update broken command line reference link

The old reference link of nova command line was broken, update it
with latest one.

Change-Id: I4ab8a4750c7090ba20def6e47d1c4fe905a8256d
Merge "Update broken command line reference link"
Merge "Fix spelling miss of password_func variable"