Modify networking examples in Qt 4.7 to use Bearer Management APIs and remove sym_iap_util.h

Several of the Qt networking examples use the convenience header "sym_iap_util.h" (eg: qftp). This header was created as a temporary solution in Qt 4.6 to avoid the underlying networking layers continually prompting the user for access point selection. Now that Qt has a proper bearer management API in 4.7, the examples should be modified to use them and the "sym_iap_util.h" header should be removed for good.

These are examples that show people how to use Qt and this convenience header is slowly creeping into user applications. We do not want to set a precedence for using non-released APIs in favour of released APIs!