Update target 'src/Ganeti/ListContants.hs' to disregard comments in
'src.Ganeti.HsContants' when extracting the names of the constants
that need to be generated from Haskell to Python.

Signed-off-by: Jose A. Lopes <jabolopes@google.com>
Reviewed-by: Thomas Thrainer <thomasth@google.com>