Scotland's "No" to independence boosts Spanish bond, stock markets

* Scots spurn independence, Spanish yields fall sharply * Spain's IBEX outperforms European stock indexes * Some analysts still see Catalonia a risk in the long run (Updates prices, adds new quote) By Marius Zaharia and Sudip Kar-Gupta LONDON, Sept 19 (Reuters) - Spanish bonds and stocks were Europe's top performers on Friday as markets viewed Scotland's vote against independence as diminishing prospects of a stronger push for secession in Catalonia. Scotland rejected indep