PR #1719: rm obsolete FAQ about sudo

doc/faq.rst

@@ -530,27 +530,6 @@ other stuff cannot be written anywhere in the image. You have three options:
 3. Run the image read-write with :code:`ch-run -w`. Be careful that multiple
    containers do not try to write to the same files.
 
-Which specific :code:`sudo` commands are needed?
-------------------------------------------------
-
-For running images, :code:`sudo` is not needed at all.
-
-For building images, it depends on what you would like to support. For
-example, do you want to let users build images with Docker? Do you want to let
-them run the build tests?
-
-We do not maintain specific lists, but you can search the source code and
-documentation for uses of :code:`sudo` and :code:`$DOCKER` and evaluate them
-on a case-by-case basis. (The latter includes :code:`sudo` if needed to invoke
-:code:`docker` in your environment.) For example::
-
-  $ find . \(   -type f -executable \
-             -o -name Makefile \
-             -o -name '*.bats' \
-             -o -name '*.rst' \
-             -o -name '*.sh' \) \
-           -exec egrep -H '(sudo|\$DOCKER)' {} \;
-
 OpenMPI Charliecloud jobs don’t work
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