ShellPkg: Add support for CTRL-C within shell user prompting

This allows for the user to get out of answering a question with CTRL-C

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jaben Carsey <jaben.carsey@intel.com>
Reviewed-by: Erik Bjorge <erik.c.bjorge@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14950 6f19259b-4bc3-4df7-8a09-765794883524
ShellPkg: Remove invalid ASSERT

There was an assumption that this API would never fail.  That is not true and the return value is checked just a few lines later.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jaben Carsey <jaben.carsey@intel.com>
Reviewed-by: Erik Bjorge <erik.c.bjorge@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14951 6f19259b-4bc3-4df7-8a09-765794883524
Per PI 1.3 spec, when Reserved bit set in the SlaveAddress parameter, EFI_NOT_FOUND should be returned in EFI_I2C_HOST_PROTOCOL.QueueRequest().

Signed-off-by: Elvin Li <elvin.li@intel.com>
Reviewed-by: Leahy Leroy P <leroy.p.leahy@intel.com>
Reviewed-by: Lin Jie <jie.lin@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14952 6f19259b-4bc3-4df7-8a09-765794883524