Trim output from tests

[jacquesalice]

In this PR:

• Remove free-floating print statements (i.e. those that don't use if showact)
• Set verbose=False for statements that had previously explicitly set verbose=True

All 64 tests pass against sparcdev2 and sparc1 (with VPN on). Output now looks like this for sparcdev2:

Arranging to run doctests against: sparcl.client
Arranging to run doctests against: sparcl.gather_2d
sssssss.................sRunning Client tests
  against Server: "sparcdev2.csdc.noirlab.edu:8050"
  comparing to: tests.expected_pat
  showact=False
  showcurl=False
  client=(sparclclient:1.2.2b8, api:11.0, http://sparcdev2.csdc.noirlab.edu:8050/sparc, client_hash=, verbose=False, connect_timeout=1.1, read_timeout=5400.0)

...s..sss..............................
----------------------------------------------------------------------
Ran 64 tests in 72.902s

OK (skipped=12)

And this for sparc1:

Arranging to run doctests against: sparcl.client
Arranging to run doctests against: sparcl.gather_2d
sssssss.................sRunning Client tests
  against Server: "sparc1.datalab.noirlab.edu"
  comparing to: tests.expected_pat
  showact=False
  showcurl=False
  client=(sparclclient:1.2.2b8, api:11.0, https://sparc1.datalab.noirlab.edu/sparc, client_hash=, verbose=False, connect_timeout=1.1, read_timeout=5400.0)

...s..sss..............................
----------------------------------------------------------------------
Ran 64 tests in 79.100s

OK (skipped=12)

[jacquesalice]

@pothiers context is now printed only once. Output after running tests looks like:

Arranging to run doctests against: sparcl.client
Arranging to run doctests against: sparcl.gather_2d
sssssssRunning Client Tests
against Server: "sparc1.datalab.noirlab.edu"
comparing to: tests.expected_pat
showact=False
showcurl=False
client=(sparclclient:1.2.2b8, api:11.0, https://sparc1.datalab.noirlab.edu/sparc, client_hash=, verbose=False, connect_timeout=1.1, read_timeout=5400.0)
.................s...s..sss..............................
----------------------------------------------------------------------
Ran 64 tests in 83.569s
OK (skipped=12)

[pothiers]

In the future, we may want to initialized show_run_context from an env var (like "showact") with a default value of True.