bugfix: Remove typo from requirements.txt

bugfix: Remove typo from requirements.txt

Wrong characters were inserted into requirements.txt during
modification of file license header. This bug caused issues
during installation of vsperf by installation scripts.
Problematic line was removed to avoid installation failures.

JIRA: VSPERF-489

Change-Id: I399eb8ecc7c42a9c42fb1e697dd6322fc9867951
Signed-off-by: Martin Klozik <martinx.klozik@intel.com>
Reviewed-by: Marco Varlese <marco.varlese@suse.com>
Reviewed-by: Al Morton <acmorton@att.com>
Reviewed-by: Christian Trautman <ctrautma@redhat.com>
Reviewed-by: Bill Michalowski <bmichalo@redhat.com>
Reviewed-by: Sridhar Rao <sridhar.rao@spirent.com>
Reviewed-by: Trevor Cooper <trevor.cooper@intel.com>