build: add more src dirs for generate_json.py
build: add more src dirs for generate_json.py

Because file vpe.api is in src/vpp/api/
and memclnt.api is in src/vlibmemory/.

Also removed api_types, as iteration can be done over output_dir_map.

Type: fix
Fixes: 9529feb4525dfd13e5636640083361256121d275
Ticket: VPP-1715

Change-Id: I021afeafdf98904d076953f0b09d1e3587fd3100
Signed-off-by: Vratko Polak <84c5f374c860783d46e9bccfb1dae3a5cc35d4f7@cisco.com>

vpp-dev/vpp,chrisy/vpp,vpp-dev/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,vpp-dev/vpp,chrisy/vpp,vpp-dev/vpp,FDio/vpp,FDio/vpp,vpp-dev/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,vpp-dev/vpp,vpp-dev/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp