tools: print normal output to stdout, and only errors and warnings to stderr in gst-launch
tools: print normal output to stdout, and only errors and warnings to stderr in gst-launch

Let's not print everything to stderr. Suppress some more 'normal' messages when --quiet was passed.

Lachann/gstreamer,cfoch/gstreamer,collects/gstreamer,krichter722/gstreamer,lovebug356/gstreamer,centricular/gstreamer,lubosz/gstreamer,jpakkane/gstreamer,surround-io/gstreamer,magcius/gstreamer,centricular/gstreamer,justinjoy/gstreamer,cablelabs/gstreamer,krieger-od/gstreamer,magcius/gstreamer,Distrotech/gstreamer,mparis/gstreamer,mrchapp/gstreamer,ensonic/gstreamer,ensonic/gstreamer,ahmedammar/platform_external_gst_gstreamer,drothlis/gstreamer,krichter722/gstreamer,cfoch/gstreamer,lubosz/gstreamer,cablelabs/gstreamer,shelsonjava/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer,jpxiong/gstreamer,jpakkane/gstreamer,jpxiong/gstreamer,lovebug356/gstreamer,centricular/gstreamer,drothlis/gstreamer,lubosz/gstreamer,krichter722/gstreamer,mparis/gstreamer,mparis/gstreamer,surround-io/gstreamer,drothlis/gstreamer,mrchapp/gstreamer,Lachann/gstreamer,collects/gstreamer,ylatuya/gstreamer,shelsonjava/gstreamer,cfoch/gstreamer,justinjoy/gstreamer,magcius/gstreamer,ahmedammar/platform_external_gst_gstreamer,shelsonjava/gstreamer,mparis/gstreamer,ahmedammar/platform_external_gst_gstreamer,cablelabs/gstreamer,surround-io/gstreamer,lovebug356/gstreamer,cfoch/gstreamer,centricular/gstreamer,mrchapp/gstreamer,ylatuya/gstreamer,cablelabs/gstreamer,justinjoy/gstreamer,StreamUtils/gstreamer,magcius/gstreamer,cablelabs/gstreamer,Distrotech/gstreamer,Distrotech/gstreamer,lovebug356/gstreamer,shelsonjava/gstreamer,ahmedammar/platform_external_gst_gstreamer,Distrotech/gstreamer,jpakkane/gstreamer,justinjoy/gstreamer,Distrotech/gstreamer,drothlis/gstreamer,collects/gstreamer,krieger-od/gstreamer,krichter722/gstreamer,ylatuya/gstreamer,StreamUtils/gstreamer,magcius/gstreamer,mrchapp/gstreamer,StreamUtils/gstreamer,justinjoy/gstreamer,jpakkane/gstreamer,surround-io/gstreamer,centricular/gstreamer,surround-io/gstreamer,ensonic/gstreamer,ensonic/gstreamer,jpxiong/gstreamer,collects/gstreamer,krieger-od/gstreamer,cfoch/gstreamer,collects/gstreamer,Lachann/gstreamer,ahmedammar/platform_external_gst_gstreamer,ylatuya/gstreamer,jpxiong/gstreamer,drothlis/gstreamer,mrchapp/gstreamer,ensonic/gstreamer,mparis/gstreamer,ylatuya/gstreamer,jpakkane/gstreamer,Lachann/gstreamer,shelsonjava/gstreamer,krieger-od/gstreamer,lubosz/gstreamer,Lachann/gstreamer,krichter722/gstreamer,jpxiong/gstreamer,lovebug356/gstreamer,lubosz/gstreamer,krieger-od/gstreamer