Add support for dotfiles of domains and groups

[yongkyunlee]

Added client support for operations for domain and group dotfiles

Solving issue lablup/backend.ai#210

[codecov]

Codecov Report

Merging #132 into master will decrease coverage by 0.23%.
The diff coverage is 21.59%.

@@            Coverage Diff             @@
##           master     #132      +/-   ##
==========================================
- Coverage   41.42%   41.18%   -0.24%     
==========================================
  Files          67       67              
  Lines        6289     6352      +63     
==========================================
+ Hits         2605     2616      +11     
- Misses       3684     3736      +52     

Impacted Files	Coverage Δ
src/ai/backend/client/func/dotfile.py	18.81% <4.41%> (-19.97%)	⬇️
src/ai/backend/client/cli/dotfile.py	38.88% <80.00%> (+6.93%)	⬆️

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[adrysn]

I think this PR looks good. However, it seems like that domain-level dotfiles are not mounted to the session container. Please refer following image. There are domain-level dotfiles, .a and .Renviron, but when I launched a session, I was unable to locate them. For group-/keypair-level dotfiles, I found no problem. (FYI, ./run.sh is a wrapper of backend.ai, so you can just think it as backend.ai)

[yongkyunlee]

I think this PR looks good. However, it seems like that domain-level dotfiles are not mounted to the session container. Please refer following image. There are domain-level dotfiles, .a and .Renviron, but when I launched a session, I was unable to locate them. For group-/keypair-level dotfiles, I found no problem. (FYI, ./run.sh is a wrapper of backend.ai, so you can just think it as backend.ai)

There was an error in the manager, so I fixed this issue here.

[adrysn]

LGTM.