Upload and activate new certificate file.
Upload and activate new certificate file.

Handle the rest interface to activate new certificate.

Change-Id: Ida636a129a042eaa03c754f57fe1bb134446e086
Signed-off-by: Dhruvaraj Subhashchandran <19c03e3300faf6397505c2237d88ece502fa4419@in.ibm.com>

openbmc/phosphor-rest-server,openbmc/phosphor-rest-server