Dev: utils: Add info when property is newly added

[liangxin1300]

case 1

# first node init
no 'priority' property

# then the second node join
set 'priority=1' with no warning/info to show this behavior

case 2

# two-node cluster running
# remove the second node
show:
WARNING: "priority" in rsc_defaults is set to 0, it was 1

case 3

# removed node re-join
show:
WARNING: "priority" in rsc_defaults is set to 1, it was 0

This PR adds info when the property is newly added, for case 1

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 53.74%. Comparing base (42ad4f1) to head (2bf5106).
Report is 10 commits behind head on master.

Files	Patch %	Lines
crmsh/utils.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1414      +/-   ##
==========================================
+ Coverage   53.63%   53.74%   +0.10%     
==========================================
  Files          80       80              
  Lines       24081    24059      -22     
==========================================
+ Hits        12917    12931      +14     
+ Misses      11164    11128      -36     

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[nicholasyang2022]

Please also change line 2803 to use %s instead of {}.