Let wildcard actions work in list=logevents&leaction=

The documentation of leaction= shows actions like "thanks/*", at the
moment this will result in a search for log_action='*', which is always
a empty list.

Changing the validation of param leaction to allow specific any string
for the asterisk in this wildcard action.

Change-Id: Ia77e499909ce6f25ce74617367fc5b622ea9a7c9
Merge "Let wildcard actions work in list=logevents&leaction="