configure: remove CR/FT related options

As part of the process for addressing removal of CR/FT related
code from master (and hence from the 3.0.0 release), it was agreed
at the OMPI devel F2F on 7/13/17 that we'd break this in to two
pieces:

1) remove the configure arguments (fewer changes)
2) remove all the CR/FT code, etc. in a subsequent bigger commit
    that may not make it in to 3.0.0 in time.

By doing 1), the available configure options would not change
in a subsequent 3.0.x release if we end up not being able to do 2)
before 3.0.0 is released.

Signed-off-by: Howard Pritchard <howardp@lanl.gov>

configure.ac

@@ -1077,7 +1077,7 @@ AC_CACHE_SAVE
 # visible again
 #
 ###########################################################
-OPAL_SETUP_FT_OPTIONS
+dnl OPAL_SETUP_FT_OPTIONS
 ###########################################################
 # The following line is always required as it contains the
 # AC_DEFINE and AM_CONDITIONAL calls that set variables used