python-thrift: set downloadfilename to prevent conflicts with thrift itself

* I was building thrift-0.9.3 from meta-oe and do_fetch was failing with wrong checksum
  because my premirror already had thrift-0.9.3.tar.gz from python-thrift, unpacking
  the archives to find what's wrong revealed what's wrong:

thrift-0.9.3.old/thrift-0.9.3/:
PKG-INFO  setup.cfg  setup.py  src  thrift.egg-info

thrift-0.9.3/thrift-0.9.3/:
aclocal     appveyor.yml  build    CMakeLists.txt  compiler       config.guess  config.hin  configure     contrib          debian   doap.rdf  install-sh        lib      ltmain.sh    Makefile.in  NOTICE        rat_exclude  sonar-project.properties  tutorial
aclocal.m4  bower.json    CHANGES  compile         composer.json  config.h      config.sub  configure.ac  CONTRIBUTING.md  depcomp  doc       json-schema.json  LICENSE  Makefile.am  missing      package.json  README.md    test                      ylwrap

  you can get the same by comparing:
  http://mirror.switch.ch/mirror/apache/dist/thrift/0.9.3/thrift-0.9.3.tar.gz
  http://sources.openembedded.org/thrift-0.9.3.tar.gz
  the later is the python-thrift one from:
  http://git.openembedded.org/meta-openembedded/commit/?id=5cc904be9d6551f6e9a6465e990df1e2de940004

  your premirror might already be polluted by this and thrift-0.10.0.tar.gz + thrift-0.11.0.tar.gz from:
  http://git.openembedded.org/meta-openembedded/commit/?id=c0416d417115fbae55d83c2d9fa3f3fca1a9e1a0
  http://git.openembedded.org/meta-openembedded/commit/?id=960ae72e101d753b712e8bc40d8bdb4a0bcb0c5e

* this should be backported all the way to morty where the conflicting
  archive was introduced and manual cleanup on sources.openembedded.org
  will be needed as well

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

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