remove fault tolerance (crs) related infrastructure from v2.x

[hppritcha]

The infrastructure for supporting FT in ompi master at this point in time is not functional. So for v2.x series we will remove this, including configury related options, and potentially the related frameworks.
Need to AC_DEFINE the appropriate macros to turn off references to FT.

• remove calls from MPI C interfaces (ft_removal: remove cr calls in 'c' interfaces ompi-release#643)
• remove ompi mca crcp
• remove ompi mca pml/crcpw component
• remove orte snapc and sstore (ft_removal: remove sstore/snapc frameworks ompi-release#654)
• remove orte tools that require crs framework,etc
• remove opal tools that require crs framework, etc.
• check in opal where opal_cr_is_enabled is being used
• check opal_init and opal_finalize
• related components from other frameworks in ORTE - ftrm
• remove from opal crs, utils/crc.[c,h]
• Update the README as well

[hppritcha]

this issue was closed by PR open-mpi/ompi-release#714