Fix chpl_regexp to use the correct CHPL_TARGET_ARCH value

chpl_regexp was using the displayed target architecture, rather than the
value used in Makefiles. This would cause it to look in the wrong
directory for a re2 install on some platforms.
Merge pull request #431 from Kyle-B/kb-chpl-target-arch-re2

Fix chpl_regexp to use the correct CHPL_TARGET_ARCH value

chpl_regexp was using the displayed target architecture, rather than the value used in Makefiles. This would cause it to look in the wrong directory for a re2 install on some platforms.
Updating util/README in preparation for the 1.10 release

Broke the previous description of the setchplenv.* scripts into two
sections -- one for quickstart, one for experienced users.

Broke the organization of the README itself into three sections:
novice, experienced user, and developer

Removed mention of the update-sources script, as I think it's time to
retire it (we haven't kept it up-to-date with recent changes and don't
have any sign that it's been used).
Added an entry for build_configs.py; removed update-sources
Fixing indentation
Disable gmp and re2 when running smoke test.
Merge pull request #433 from bradcray/utilImprovementsFor1dot10

Util improvements for 1.10

Doing some housecleaning in the util/ directory for the 1.10 release:

* Updated the README to note the quickstart scripts vs. "production" versions
* Sorted the README into beginner / experienced / developer categories
* Added a README entry for build_configs.py which hadn't been noted previously (?)
* Removed the update-sources script, as we have not kept it up-to-date
Use fifo for smoke test to speed it up even more.
Revert "Use fifo for smoke test to speed it up even more."

This reverts commit 5a2e2c5353349f7aaedec0bd26a1eead1b756cd0.
Merge pull request #434 from thomasvandoren/speed-up-travis

Disable gmp and re2 when running smoke test.