sfscan: validate configured proxy

[bcoles]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1228 (99204ac) into master (01eea6b) will increase coverage by 1.73%.
The diff coverage is 51.06%.

@@            Coverage Diff             @@
##           master    #1228      +/-   ##
==========================================
+ Coverage   50.82%   52.56%   +1.73%     
==========================================
  Files         442      466      +24     
  Lines       35727    37958    +2231     
==========================================
+ Hits        18159    19952    +1793     
- Misses      17568    18006     +438     

Impacted Files	Coverage Δ
modules/sfp_alienvault.py	21.73% <0.00%> (ø)
modules/sfp_apple_itunes.py	20.79% <0.00%> (-1.44%)	⬇️
modules/sfp_archiveorg.py	25.60% <0.00%> (ø)
modules/sfp_arin.py	31.91% <0.00%> (-0.74%)	⬇️
modules/sfp_badpackets.py	23.07% <ø> (ø)
modules/sfp_binaryedge.py	13.18% <0.00%> (-0.15%)	⬇️
modules/sfp_bingsearch.py	55.31% <0.00%> (ø)
modules/sfp_bingsharedip.py	38.75% <ø> (ø)
modules/sfp_blockchain.py	43.24% <0.00%> (ø)
modules/sfp_botscout.py	55.55% <0.00%> (ø)
... and 355 more

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