test: use relative path for copying VPP API executor to device (#1480)
test: use relative path for copying VPP API executor to device (#1480)

Make path independent of pybot execution directory. Use relative
path from library dir instead.

Signed-off-by: samuel.elias <d838d617616898a9102a976288eaa6f77e3e0c67@cisco.com>

Co-authored-by: samuel.elias <d838d617616898a9102a976288eaa6f77e3e0c67@cisco.com>
ondrej-fabry/vpp-agent,ondrej-fabry/vpp-agent,VladoLavor/vpp-agent,ondrej-fabry/vpp-agent,VladoLavor/vpp-agent,VladoLavor/vpp-agent