Fix wrong shebang in download scripts

Download does not support python2 so shebang
could cause problem.
This commit fixes that or removes shebang where
not necessary.

Issue-ID: OOM-1964

Change-Id: I443f5ef61b9bddfddba66d858d8f65c5ceacd90a
Signed-off-by: Milan Verespej <m.verespej@partner.samsung.com>
11 files changed