Comment 2 for bug 1816655

Here's a branch that implements this: user/sandbergja/lp1816655_booking_patron_search

Here's a link: https://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/sandbergja/lp1816655_booking_patron_search

Testing instructions from the commit message:

1) Apply this patch
2) Go to Booking > Create Reservation
3) Choose a resource type
4) Choose a time and double click (or press the Create Reservation
   button)
5) Note that there is now a Search for Patrons button
6) Use this button to search for a patron.
7) Click the select button.
8) Note that the patron's barcode appears in the
Patron Barcode field
9) Click Confirm Reservation
10) Note that the reservation was made.