Cyril Plisko 64d7b6cf75 Override default SPA config location via environment
When using zdb with non-default SPA config file it is not convenient
to add -U <non-default-config-file-path> all the time. This commit
introduces support for setting/overriding SPA config location via
environment variable 'SPA_CONFIG_PATH'.

If -U flag is specified in the command line it will override any other
value as usual.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1545
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