users: adds search and pagination (#7753)

ref #7469. Follow up change that adds proper paging with 50 results
per page as well as a search box to search by name, login or email.

pkg/api/user.go

@@ -239,7 +239,9 @@ func searchUser(c *middleware.Context) (*m.SearchUsersQuery, error) {
 		page = 1
 	}
 
-	query := &m.SearchUsersQuery{Query: "", Page: page, Limit: perPage}
+	searchQuery := c.Query("query")
+
+	query := &m.SearchUsersQuery{Query: searchQuery, Page: page, Limit: perPage}
 	if err := bus.Dispatch(query); err != nil {
 		return nil, err
 	}