v4l2bufferpool: Use unique name for v4l2bufferpool object

Assign unique sequence number to an object name for better debugging
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manual
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  Build
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build cerbero cross-android universal
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gst-ios-13.2
build cerbero cross-ios universal
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build cerbero cross win32
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build cerbero cross win64
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build cerbero fedora x86_64
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gst-macos-10.15
build cerbero macos x86_64
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build clang fedora x86_64
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build fedora x86_64
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docker windows 1809 allowed to fail manual
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 1809
build vs2017 amd64
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docker windows 1809
build vs2017 x86
 
  Test
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check fedora
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integration testsuites fedora 1/4
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gstreamer
valgrind bad
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  Integrate
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cross-android universal examples
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gst-ios-13.2
cross-ios universal examples
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documentation