fix: 整改netmanager_base组件system权限，改为user权限

close #I5506C
Signed-off-by: Nhuangjieliang <huangjieliang@huawei.com>
Change-Id: Ie4f6bc04eac2ab48ddf2c3f70095570b89985427

services/etc/group

@@ -69,3 +69,4 @@ msdp:x:6699:
 misc:x:9998:
 app:x:10000:
 useriam:x:1088:
+net_manager:x:1099:

services/etc/passwd

@@ -70,3 +70,4 @@ msdp:x:6699:6699:::/bin/false
 misc:x:9998:9998:::/bin/false
 app:x:10000:10000:::/bin/false
 useriam:x:1088:1088:::/bin/false
+net_manager:x:1099:1099:::/bin/false