Merged from trunk 10853:10869

   Merged from trunk 10853:10869

   | 10854   | Avoid python-2.6 deprecation warnings for md5 and sha        |
   | zmedico | modules by trying to import hashlib first and then falling   |
   |         | back to the deprecated modules if necessary. Thanks to       |
   |         | ColdWind for reporting.                                      |

   | 10855   | Reimplement parallel-fetch by spawning the `ebuild fetch`    |
   | zmedico | command for each ebuild. The benefit of using this approach  |
   |         | is that it can be integrated together with parallel build    |
   |         | scheduling that's planned. Parallel-fetch support for        |
   |         | binhost is not implemented yet, though it worked previously. |

   | 10856   | Clear the self._task_queue to avoid duplicate parallel-fetch |
   | zmedico | tasks in --keep-going mode.                                  |

   | 10857   | Add "(no inline comments)" to qualify "comments begin with   |
   | zmedico | #" statements.                                               |

   | 10858   | Bug #230245 - Pass the correct directory when calling `snv   |
   | zmedico | list` and `svn status` since repoman supports category-level |
   |         | and repo-level commits.                                      |

   | 10859   | Bug #230245 - Use os.path.basename() on paths returned from  |
   | zmedico | `svn list` and `svn status`.                                 |

   | 10860   | Bug #230249 - Disable the "ebuild.notadded" check when not   |
   | zmedico | in commit mode and running `svn list` and `svn status` calls |
   |         | in every package dir will be too expensive.                  |

   | 10861   | Fix typo.                                                    |
   | zmedico |                                                              |

   | 10862   | add a call to pruneNonExisting() at the end of               |
   | zmedico | dbapi.vartree.PreservedLibsRegistry.__init__()               |

   | 10864   | Split out a write_contents() function and a                  |
   | zmedico | vardbapi.removeFromContents() function. This is refactoring  |
   |         | of code from the blocker file collision contents handling in |
   |         | dblink.treewalk(). Also, there is a new                      |
   |         | dblink._match_contents() method derived from isowner(). It   |
   |         | returns the exact path from the contents file that matches   |
   |         | the given path, regardless of path differences due to things |
   |         | such as symlinks.                                            |

   | 10865   | Handle potential errors in PreservedLibsRegistry.store() now |
   | zmedico | that it can be called via pruneNonExisting(), due to things  |
   |         | such as portageq calls where the user may not have write     |
   |         | permission to the registry.                                  |

   | 10866   | Also avoid sandbox violations in                             |
   | zmedico | PreservedLibsRegistry.store(), for running portage inside    |
   |         | ebuild phases.                                               |

   | 10867   | Never do realpath() on an empty string for                   |
   | zmedico | portdbapi.porttree_root since otherwise it can evaluate to   |
   |         | $CWD which leads to undesireable results.                    |

   | 10868   | Add a new BinpkgFetcherAsync class and use it to implement   |
   | zmedico | parellel-fetch for --getbinpkg.                              |

   | 10869   | Add a "prefix" keyword parameter to slot_dict_class() which  |
   | zmedico | controls the prefix used when mapping attribute names from   |
   |         | keys. Use this to change the syntax from files["foo"] to     |
   |         | files.foo (it's fewer characters to look at).                |

svn path=/main/branches/prefix/; revision=10880