[.gitignore]: Update src, config engine (#754)

Signed-off-by: marian-pritsak <marianp@mellanox.com>

.gitignore

@@ -24,6 +24,13 @@ src/snmpd/*
 src/thrift/*
 !src/thrift/Makefile
 src/sonic-device-data/src/device/
+src/sonic-device-data/src/debian/
+src/igb/*
+!src/igb/Makefile
+src/mpdecimal/*
+!src/mpdecimal/Makefile
+src/python3/*
+!src/python3/Makefile
 
 # Autogenerated Dockerfiles
 dockers/docker-base/Dockerfile
@@ -43,3 +50,8 @@ platform/*/docker-syncd-*-rpc/Dockerfile
 
 # Installer-related files and directories
 installer/x86_64/platforms/
+
+# Config engine
+src/sonic-config-engine/**/*.pyc
+src/sonic-config-engine/build
+src/sonic-config-engine/sonic_config_engine.egg-info