Upgrade botocore to 1.4.21
Upgrade botocore to 1.4.21

dstufft/warehouse,wlonk/warehouse,wlonk/warehouse,karan/warehouse,dstufft/warehouse,karan/warehouse,alex/warehouse,dstufft/warehouse,pypa/warehouse,alex/warehouse,wlonk/warehouse,pypa/warehouse,karan/warehouse,karan/warehouse,pypa/warehouse,alex/warehouse,alex/warehouse,karan/warehouse,alex/warehouse,dstufft/warehouse,pypa/warehouse