siggen: compare runtaskdeps dictionary even when they have the same size

siggen: compare runtaskdeps dictionary even when they have the same size

* otherwise it reports lots of changed checksums just because it compares different tasks

  notice linux-libc-headers_3.1.bb.do_package_write:
  Task dependency hash changed from 42acced29debf54d598802474c5e9cbb to f438a54f995df77620d0727d6f4b4ce5 (for linux-libc-headers_3.1.bb.do_package_write and linux-gta04_git.bb.do_deploy)
  Task dependency hash changed from 61f8babe1d10c6e7fb1423112bb04e1e to 1b3e21ff106ecfcb7ddf76a1e29537bb (for linux-nokia900-meego_git.bb.do_deploy and linux-gta04_git.bb.do_package_write)
  Task dependency hash changed from 512f9d6686d760b318d8b11c8b589226 to 42acced29debf54d598802474c5e9cbb (for linux-nokia900-meego_git.bb.do_package_write and linux-libc-headers_3.1.bb.do_package_write)
  Task dependency hash changed from 153e91dfd1d2053fda7b98cc08d4b802 to 92a293bdd8ed234932b87a66025038c5 (for systemd-serialgetty.bb.do_package_write and systemd-serialgetty.bb.do_package_write)
  Task dependency hash changed from 730abebf9954794bb440c2f3239f79fe to 413eaebaff27a2fd16f5cf68c1f4ff17 (for systemd_git.bb.do_package_write and systemd_git.bb.do_package_write)

  with this patch:
  Dependency on task linux-nokia900-meego_git.bb.do_package_write was added
  Dependency on task linux-nokia900-meego_git.bb.do_deploy was added
  Dependency on task linux-gta04_git.bb.do_deploy was removed
  Dependency on task linux-gta04_git.bb.do_package_write was removed
  Hash for dependent task systemd_git.bb.do_package_write changed from 730abebf9954794bb440c2f3239f79fe to 413eaebaff27a2fd16f5cf68c1f4ff17
  Hash for dependent task systemd-serialgetty.bb.do_package_write changed from 153e91dfd1d2053fda7b98cc08d4b802 to 92a293bdd8ed234932b87a66025038c5

* added test if there is different task with same hash then we don't
  show it as added/removed dependency, because bitbake doesn't care

(Bitbake rev: ca52bf32b479811bd7fed41648bedcc06b00430b)

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>