Use scancode-reindex-licenses to generate index

The `--reindex-licenses` flag has been removed from the main
`scancode` executable into the separate subcommand
`scancode-reindex-licenses`.

Signed-off-by: Abhishek Kumar <abhi.kr.2100@gmail.com>

Author: abhi-kr-2100

Dockerfile

@@ -37,9 +37,9 @@ WORKDIR /scancode-toolkit
 # Copy sources into docker container
 COPY . /scancode-toolkit
 
-# Run scancode once for initial configuration, with 
-# --reindex-licenses to create the base license index
-RUN ./scancode --reindex-licenses
+# Run scancode-reindex-licenses once for initial configuration and to create
+# the base license index
+RUN ./scancode-reindex-licenses
 
 # Add scancode to path
 ENV PATH=/scancode-toolkit:$PATH