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The certificate generation tool currently checks if all command
line options required to create all certificates in the CoT have
been specified. This prevents using the tool to create individual
certificates when the whole CoT is not required.

This patch improves the checking function so only those options
required by the certificates specified in the command line are
verified.

Change-Id: I2c426a8e2e2dec85b15f2d98fd4ba949c1aed385