turn_sock: do not cleanup while binding #18

Job	Run time
build-mac-default-full-bundle-3	18m 15s
build-mac-default-full-bundle-2	11m 55s
build-mac-default-full-bundle-1	2m 18s
build-mac-default	4m 4s
build-mac-gnu-tls	2m 58s
build-mac-openssl	2m 3s
build-mac-video-ffmpeg	8m 37s
build-mac-video-openh264-1	3m 8s
build-mac-video-openh264-2	12m 20s
build-mac-video-openh264-3	18m 16s
build-mac-video-vid-toolbox	2m 5s
build-ubuntu-default	1m 36s
build-ubuntu-default-full-bundle-1	2m 22s
build-ubuntu-default-full-bundle-2	10m 36s
build-ubuntu-default-full-bundle-3	27m 42s
build-ubuntu-gnu-tls	2m 24s
build-ubuntu-no-tls	2m 28s
build-ubuntu-video-ffmpeg	6m 28s
build-ubuntu-video-openh264-1	3m 55s
build-ubuntu-video-openh264-2	11m 5s
build-ubuntu-video-openh264-3	28m 29s
build-windows-default	21s
build-windows-gnu-tls	4m 17s
build-windows-video-ffmpeg	7m 36s
build-windows-with-openssl-unit-test-1	21s
build-windows-with-openssl-unit-test-2	28s
build-windows-with-video-libvpx-unit-test-1	18s
	3h 16m 25s

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