Change default # of bootstrap-select items displayed to 10
Change default # of bootstrap-select items displayed to 10

https://bugzilla.redhat.com/show_bug.cgi?id=1264511
https://github.com/ManageIQ/manageiq/issues/4119
https://github.com/ManageIQ/manageiq/issues/4068
(transferred from ManageIQ/manageiq@6a710b85c416e0cc9ed8932aecdc2b44c0384078)

ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic