Use the EbuildFetcher class to implement async fetch for the EbuildBuild

class. When in background mode, fetch output is logged to emerge-fetch.log.
This solves a problem with calling doebuild(returnpid=1) and then doebuild
calling fetch() synchronously. In that case, doebuild would return an int
if fetch() failed (including when running pkg_nofetch), which would lead
to a TypeError since doebuild(returnpid=1) is supposed to return a list
containing a spawned pid.

svn path=/main/trunk/; revision=11002

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