phosphor-ipmi-flash: Fix all C++ warnings

Change-Id: I89236b2dab88ca725e269bb8f5b2cbfd271e807a
Signed-off-by: Willy Tu <wltu@google.com>

cleanup: let the handler own the file system implementation

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: Ic7c31237bd5440b2cfa171df93545a63708e404c

cleanup: drop inclusion of unused filesystem header

The filesystem header is included and referenced but never used.

This is a leftover from before the filesystem calls where handled
through an int

cleanup: drop inclusion of unused filesystem header

The filesystem header is included and referenced but never used.

This is a leftover from before the filesystem calls where handled
through an interface.

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I69e5ba22ea853b2582cf99b679e72d81f30ee74e

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update gcc10 and clang-format10

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I72239b884615d26b2c4311c49a26e2eced0a1fb0

bmc: add cleanup blob handler

Add a cleanup blob handler, such that there is a new blob id present
named "/flash/cleanup" that will delete temporary files. This blob
handler expects a client to ope

bmc: add cleanup blob handler

Add a cleanup blob handler, such that there is a new blob id present
named "/flash/cleanup" that will delete temporary files. This blob
handler expects a client to open/commit/close the blob. This blob
handler will delete files that are specified as temporary. The host
client may use this to clean up artifacts on verification or update
failure.

This can be extended later to handle calling a service or doing anything
else to cleanup. The cleanup handler will be added if
--enable-cleanup-delete. The recipe will automatically add this blob
handler if that configure variable is set.

Tested: Not tested on real hardware.
Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I4502b2613e38f0a947d7235d084287376c6b0ce1

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