be less strict in product renames

do not check the migration product as it can have different
name in SP2 and SP3, more over it might not be present when using
custom migration) (bnc#800515)

Conflicts:

	package/yast2-wagon.changes
fixed regexp for searching hook scripts (bnc#813235)

do not match scripts for different steps

Conflicts:

	package/yast2-wagon.changes
always display full hook name in the popup (bnc#813235)