tests: Set vmod import paths to local build
Tests were failing with:
**** v1 CLI RX|Message from VCC-compiler:
**** v1 CLI RX|Could not find VMOD querysort
**** v1 CLI RX|('<vcl.inline>' Line 5 Pos 16)
**** v1 CLI RX| import querysort;
**** v1 CLI RX|---------------#########-
**** v1 CLI RX|
**** v1 CLI RX|Running VCC-compiler failed, exited with 2
**** v1 CLI RX|VCL compilation failed
---- v1 FAIL VCL does not compile