rtsp-client: RTP Info when completed_sender

Change condition that should be fulfilled regarding RTPInfo.
Replace !gst_rtsp_media_is_receive_only with
gst_rtsp_media_has_completed_sender. It is more correct to actually look
for a sender pipeline that is complete. Only then a RTPInfo should
exist.

gst_rtsp_media_is_receive_only gives different answears depending on
state of server.
If Describe is called wth URL+options for backchannel SDP will give only
audio and only backchannel a=sendonly
If Describe is called on URL+options that gives both audio and video
direction from server to client, pipelines are created. Thus
receive_only will return false, even though Setup only would setup
backchannel.

RTP-Info is only for outgoing streams. Thus one should look if outgoing
streams are complete.
21 jobs for backport_66_to_1_16 in 96 minutes and 27 seconds (queued for 2 seconds)
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gst indent

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manifest

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  Build
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build cerbero android universal

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gst-ios-12.2
build cerbero ios universal

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gst-macos-10.14
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build fedora x86_64

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docker windows 1607
build msys2

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build nodebug fedora x86_64

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build static fedora x86_64

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build static nodebug fedora x86_64

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docker windows 1607
build vs2017 amd64

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docker windows 1607
build vs2017 x86

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build cerbero android universal

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gst-ios-12.2
build cerbero ios universal

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build fedora x86_64

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gstreamer
check fedora

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gstreamer
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  Integrate
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android universal examples

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