scripts/oe-depends-dot: add it to handle dot filesrbt/oe-dot

Add it to handle recipe-depends.dot and task-depends.dot. E.g.:

* Print why rpm is built
  $ oe-depends-dot -k rpm --why/-w recipe-depends.dot
  Because: core-image-sato libdnf libsolv dnf

* Print bzip2-native's depends
  $ oe-depends-dot -k bzip2-native --depends/-d recipe-depends.dot
  Depends: automake-native gnu-config-native libtool-native quilt-native autoconf-native

* Remove duplicated dependencies to reduce the size of the dot files.
  For example, A->B, B->C, A->C, then A->C can be removed. The dot files are too
  big, we nearly couldn't use 'dot -T' to generate pictcures for target recipes,
  remove the duplicated dependencies makes is it possible.
  $ bitbake core-image-sato -g
  $ oe-depends-dot -r recipe-depends.dot
  Saving reduced dot file to recipe-depends-reduced.dot
  $ du -sh recipe-depends*.dot
  608K    recipe-depends.dot
  32K     recipe-depends-reduced.dot

  It has been recuded from 608K to 32K, now we can generate a picture,
  otherwise, it is too big:
  $ dot -Tpng recipe-depends-reduced.dot -O

It also can handle task-depends.dot.

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>

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