fix: check health too long when dfdaemon is unavailable

[Louhwz]

Description

1. Use for loop with buffered channel and time.After to control timeout
2. refactor some redundant log and variable

Related Issue

#343

Motivation and Context

1. When dfdaemon is unavailable, dfget will stuck in health checking for a long time. This will slow downloading task.

Screenshots (if appropriate):

Now timeout works.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation Update (if none of the other choices apply)

Checklist:

• Code compiles correctly.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[yxxhero]

@Louhwz You only have one commit incorrectly signed off! Please fix it.

[Louhwz]

@Louhwz You only have one commit incorrectly signed off! Please fix it.

thanks

[jim3ma]

LGTM

[codecov-commenter]

Codecov Report

Merging #344 (2fe459a) into main (a28a812) will increase coverage by 0.14%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #344      +/-   ##
==========================================
+ Coverage   41.12%   41.26%   +0.14%     
==========================================
  Files          61       61              
  Lines        4832     4832              
==========================================
+ Hits         1987     1994       +7     
+ Misses       2595     2587       -8     
- Partials      250      251       +1     

Flag	Coverage Δ
unittests	41.26% <ø> (+0.14%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
client/daemon/peer/peertask_base.go	34.46% <0.00%> (+1.69%)	⬆️