json/test: remove executable permisions on unrelated files

This patch removes executable flag from couple files
that should not have it.

Signed-off-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Change-Id: Ib4287ec3763a4187a756c18845c61d8b50729820
Reviewed-on: https://review.gerrithub.io/368042


Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>