Make cert generate for readonly directories

When run from a development PC, we shouldn't REQUIRE that the cert
directory exists or is writable.

This commit reworks the SSL cert generation to genera

Make cert generate for readonly directories

When run from a development PC, we shouldn't REQUIRE that the cert
directory exists or is writable.

This commit reworks the SSL cert generation to generate a string with
the certification info, instead of writing it to disk and reading it
back. This allows bmcweb to start up in read-only environments, or
environments where there isn't access to the key information.

Tested: Launching the application on a dev desktop without an ssl
directory present no longer crashes.

Change-Id: I0d44eb1ce8d298986c5560803ca2d72958d3707c
Signed-off-by: Ed Tanous <ed@tanous.net>

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