Fixes #4461: Move r31245 to v1.8 branch (mtl mxm: silent a warning.)

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r31245 [[BR]]
mtl mxm: silent a warning.

in ompi_mtl_mxm_add_procs, define the ep_index variable only
for an older version of mxm.

submitted by Alina, reviewed by Mike.
cmr=v1.8:reviewer=ompi-rm1.8
Fixes #4459: Move r31244 to v1.8 branch (BUILD: fix "make dist" failure)

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r31244 [[BR]]
BUILD: fix "make dist" failure on some linux distro with old csh/tcsh

on some linux distro (sles11sp2) csh fails to parse $LS_COLORS and borks with error:
Unknown colorls variable `mh'.

The workaround is to unset LS_COLORS before calling to csh script

reviewed by Jeff

cmr=v1.8:reviewer=ompi-rm1.8
Fixes #4462: Move r31246 to v1.8 branch (ompi_info.1: Include much more info)

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r31246 [[BR]]
ompi_info.1: Include much more info about the --level CLI option

Add a lot more information about the --level CLI option, and the nine
levels.

Also remove some now-erroneous examples regarding --version.

cmr=v1.8:reviewer=rhc
Fixes #4318: Move r30889 to v1.8 branch (Send the BTL-passed message to)

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r30889 [[BR]]
Send the BTL-passed message to ompi_rte_abort.

cmr=v1.8:reviewer=rolfv
Fixes #4463: Move r31248 to v1.8 branch (Silence warnings)

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r31248 [[BR]]
Silence warnings

cmr=v1.8:reviewer=rhc