SAML2: Fix generation of mdui:Keyword with ampersand in keyword.
SAML2: Fix generation of mdui:Keyword with ampersand in keyword.

Same problem as fixed in r3241.

git-svn-id: a243b28a2a52d65555a829a95c8c333076d39ae1@3242 44740490-163a-0410-bde0-09ae8108e29a

maytechnet/simplesamlphp,grnet/simplesamlphp,sylvainmed/simplesamlphp,cwaldbieser/simplesamlphp,girgen/simplesamlphp,dialogik/simplesamlphp,girgen/simplesamlphp,simplesamlphp/simplesamlphp,Kunstmaan/simplesamlphp,sitya/simplesamlphp,gtkrug/simplesamlphp,dnmvisser/simplesamlphp,StudentLifeMarketingAndDesign/simplesamlphp,StudentLifeMarketingAndDesign/simplesamlphp,dzuelke/simplesamlphp,simplesamlphp/simplesamlphp,simplesamlphp/simplesamlphp,shoaibali/simplesamlphp,sylvainmed/simplesamlphp,dzuelke/simplesamlphp,Kunstmaan/simplesamlphp,dialogik/simplesamlphp,dialogik/simplesamlphp,madmatt/simplesamlphp,ghalse/simplesamlphp,sylvainmed/simplesamlphp,sitya/simplesamlphp,dzuelke/simplesamlphp,gtkrug/simplesamlphp,dialogik/simplesamlphp,maytechnet/simplesamlphp,sitya/simplesamlphp,ghalse/simplesamlphp,jschlyter/simplesamlphp,girgen/simplesamlphp,dzuelke/simplesamlphp,sylvainmed/simplesamlphp,BrettMerrick/simplesamlphp,jschlyter/simplesamlphp,grnet/simplesamlphp,dnmvisser/simplesamlphp,StudentLifeMarketingAndDesign/simplesamlphp,grnet/simplesamlphp,ghalse/simplesamlphp,maytechnet/simplesamlphp,dnmvisser/simplesamlphp,Kunstmaan/simplesamlphp,ghalse/simplesamlphp,jschlyter/simplesamlphp,shoaibali/simplesamlphp,grnet/simplesamlphp,girgen/simplesamlphp,dnmvisser/simplesamlphp,dialogik/simplesamlphp,shoaibali/simplesamlphp,shoaibali/simplesamlphp,BrettMerrick/simplesamlphp,cwaldbieser/simplesamlphp,StudentLifeMarketingAndDesign/simplesamlphp,gtkrug/simplesamlphp,sitya/simplesamlphp,BrettMerrick/simplesamlphp,girgen/simplesamlphp,jschlyter/simplesamlphp,madmatt/simplesamlphp,jschlyter/simplesamlphp,madmatt/simplesamlphp,simplesamlphp/simplesamlphp,cwaldbieser/simplesamlphp,Kunstmaan/simplesamlphp,madmatt/simplesamlphp,maytechnet/simplesamlphp,cwaldbieser/simplesamlphp,BrettMerrick/simplesamlphp,gtkrug/simplesamlphp