ENH(TEMP workaround): monkeypatch getpass to echo its input + RF (Credentials)

[yarikoptic]

also mark private credential fields explicitly (before everything was considered private since only getpass could have been used so that our prompts appeared from under the annex)

[yarikoptic]

yeay... works even through entire sandwich of things:

$> datalad install Field_L_cells/gg0304_10_B/conspecific/s*          
2016-05-26 15:43:18,178 [INFO   ] Installing <Dataset path=/tmp/aa-1> (install.py:382)
You need to authenticate with 'crcns' credentials. https://crcns.org/request-account/ provides information on how to gain access
user: datalad

2016-05-26 15:43:32,977 [INFO   ] Installing <Dataset path=/tmp/aa-1> (install.py:382)
2016-05-26 15:43:33,623 [INFO   ] Installing <Dataset path=/tmp/aa-1> (install.py:382)
2016-05-26 15:43:34,267 [INFO   ] Installing <Dataset path=/tmp/aa-1> (install.py:382)

here the datalad calls annex, that one calls our archives backend, which in turn request annex back to get a file from crcns, which in turn delegates to our custom remote, and that one asks a question ;-)

now need to fix that screw up I introduced for install ;)

[codecov-io]

Current coverage is 83.06%

Merging #483 into master will increase coverage by <.01%

1. 2 files (not in diff) in datalad/distribution were modified. more
   • Misses +2
   • Hits +10
2. 3 files (not in diff) in datalad were modified. more
   • Misses -6
   • Hits -12

@@             master       #483   diff @@
==========================================
  Files           166        166          
  Lines         13593      13595     +2   
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
+ Hits          11288      11292     +4   
+ Misses         2305       2303     -2   
  Partials          0          0          

Powered by Codecov. Last updated by b2cd806...0249a03

[coveralls]

Coverage decreased (-0.005%) to 83.06% when pulling 0249a03 on yarikoptic:enh-ui-with-echo into 6d79e49 on datalad:master.

[yarikoptic]

in attempt to get those missing coverages I got some RF'ing done

[coveralls]

Coverage increased (+0.2%) to 83.267% when pulling 63d420a on yarikoptic:enh-ui-with-echo into 6d79e49 on datalad:master.

[coveralls]

Coverage increased (+0.3%) to 83.389% when pulling bb646ea on yarikoptic:enh-ui-with-echo into b2cd806 on datalad:master.

[coveralls]

Coverage increased (+17.0%) to 100.0% when pulling c055c77 on yarikoptic:enh-ui-with-echo into b2cd806 on datalad:master.

[yarikoptic]

woohoo -- +0.4% coverage and tests pass! will merge tomorrow if noone objects

[yarikoptic]

noone objected, merging!