Move from _pubkey to _keyinfo

[dmach]

Fixes: #1283

[pep8speaks]

Hello @dmach! Thanks for opening this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file osc/obs_api/keyinfo.py:

Line 36:5: E303 too many blank lines (2)
Line 41:121: E501 line too long (125 > 120 characters)
Line 66:121: E501 line too long (133 > 120 characters)
Line 78:121: E501 line too long (127 > 120 characters)
Line 105:121: E501 line too long (134 > 120 characters)

[codecov]

Codecov Report

Attention: Patch coverage is 0.57803% with 172 lines in your changes are missing coverage. Please review.

Project coverage is 31.27%. Comparing base (7b73fde) to head (7f6c0b3).
Report is 42 commits behind head on master.

Files	Patch %	Lines
osc/obs_api/keyinfo.py	0.00%	65 Missing ⚠️
osc/obs_api/keyinfo_sslcert.py	0.00%	33 Missing ⚠️
osc/fetch.py	3.03%	32 Missing ⚠️
osc/obs_api/keyinfo_pubkey.py	0.00%	23 Missing ⚠️
osc/commandline.py	0.00%	18 Missing ⚠️
osc/obs_api/__init__.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1518      +/-   ##
==========================================
- Coverage   31.48%   31.27%   -0.21%     
==========================================
  Files         103      106       +3     
  Lines       19072    19190     +118     
==========================================
- Hits         6004     6002       -2     
- Misses      13068    13188     +120     

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