utils: add and improve debug messages
utils: add and improve debug messages

... so they end up in a more expected debug category rather than oblivion.

collects/gstreamer,lovebug356/gstreamer,krieger-od/gstreamer,lovebug356/gstreamer,cfoch/gstreamer,krieger-od/gstreamer,lubosz/gstreamer,cfoch/gstreamer,ensonic/gstreamer,ensonic/gstreamer,justinjoy/gstreamer,shelsonjava/gstreamer,jpxiong/gstreamer,justinjoy/gstreamer,jpakkane/gstreamer,krichter722/gstreamer,mparis/gstreamer,jpakkane/gstreamer,Lachann/gstreamer,surround-io/gstreamer,krieger-od/gstreamer,cfoch/gstreamer,cfoch/gstreamer,jpakkane/gstreamer,surround-io/gstreamer,collects/gstreamer,cablelabs/gstreamer,centricular/gstreamer,cablelabs/gstreamer,surround-io/gstreamer,Lachann/gstreamer,shelsonjava/gstreamer,justinjoy/gstreamer,mparis/gstreamer,jpakkane/gstreamer,cfoch/gstreamer,lovebug356/gstreamer,shelsonjava/gstreamer,ensonic/gstreamer,lovebug356/gstreamer,krichter722/gstreamer,shelsonjava/gstreamer,Lachann/gstreamer,jpxiong/gstreamer,mparis/gstreamer,StreamUtils/gstreamer,cablelabs/gstreamer,centricular/gstreamer,lubosz/gstreamer,surround-io/gstreamer,krieger-od/gstreamer,Lachann/gstreamer,collects/gstreamer,StreamUtils/gstreamer,collects/gstreamer,cablelabs/gstreamer,jpxiong/gstreamer,lubosz/gstreamer,krichter722/gstreamer,jpxiong/gstreamer,StreamUtils/gstreamer,krichter722/gstreamer,collects/gstreamer,lubosz/gstreamer,mparis/gstreamer,surround-io/gstreamer,lubosz/gstreamer,centricular/gstreamer,mparis/gstreamer,krichter722/gstreamer,justinjoy/gstreamer,justinjoy/gstreamer,centricular/gstreamer,krieger-od/gstreamer,jpxiong/gstreamer,StreamUtils/gstreamer,ensonic/gstreamer,ensonic/gstreamer,cablelabs/gstreamer,shelsonjava/gstreamer,jpakkane/gstreamer,lovebug356/gstreamer,centricular/gstreamer,Lachann/gstreamer,StreamUtils/gstreamer