INTEG-250: [Unified Search] Hard-coded search settings

Fix description:
- Set search properties by using Portlet Preferences.

Conflicts:
	integ-search-portlet/src/main/java/org/exoplatform/commons/quicksearch/QuickSearch.java
	integ-search-portlet/src/main/java/org/exoplatform/commons/unifiedsearch/Search.java