The messages should be printed only in the event of CUDA builds and in the
presence of supporting hardware and when PSM2 MTL has actually been selected
for use. To this end, move help text output to component init phase.
Also use opal_setenv/unsetenv() for safer setting, unsetting of the environment
variable and sanitize the help text message.
Signed-off-by: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@intel.com>
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