Support filtering Apps by Category.

Change-Id: I327bc5d8e4a0a2ffe6ebf0cb2dadfd85919be6fc
Implements: blueprint categories-of-services
Connect UI search field to murano-api call.

It just adds '?search=searched_text' to query string.

Change-Id: I0012e8cc3e8a1ff936df4b18f66edb52c2ba641f
Partially-implements: blueprint app-catalog-search
Merge "Support filtering Apps by Category."
Merge "Connect UI search field to murano-api call."