client and docker_wrapper: lower-case image and container names

[davidpanderson]

involves #6028

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.

Project coverage is 11.95%. Comparing base (1e99ff5) to head (327d514).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/util.cpp	0.00%	10 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6033      +/-   ##
============================================
- Coverage     11.95%   11.95%   -0.01%     
  Complexity     1068     1068              
============================================
  Files           280      280              
  Lines         36974    36982       +8     
  Branches       8533     8533              
============================================
  Hits           4420     4420              
- Misses        32154    32162       +8     
  Partials        400      400              

Files with missing lines	Coverage Δ
lib/app_ipc.cpp	0.00% <ø> (ø)
lib/str_util.h	0.00% <ø> (ø)
lib/url.cpp	87.74% <ø> (ø)
lib/util.cpp	21.42% <0.00%> (-0.99%)	⬇️