NIFI-5468 add keypasswd with the default of keystorepasswd for bc compatibility
NIFI-5468 Use ARG instead of ENV for PATH variables as those need to be controlled in the build
NIFI-5468 Use BASE_URL for the default case when MIRROR_BASE_URL is not defined (and replace ARCHIVE_BASE_URL)
This closes#2921
Signed-off-by: Andrew I. Christianson <andy@andyic.org>
Modified Docker startup scripts to accept Environment variables if available, or use the usual defaults if not.
Updated readme to reflect changes in allowing environment variables.
Updated readme to correctly reflect the default ports that NiFi will run on.
This closes#2439
Signed-off-by: Jeremy Dyer <jeremydyer@apache.org>