Dev: Parsing resource meta attributes dynamically

[liangxin1300]

With the latest pacemaker version (since 2.1.8),
crmsh can get the resource meta attributes by parsing the output of crm_resource --list-options=primitive --output-as=xml command.

The benefit of this approach:

• Avoid hardcoding the resource meta attributes
• Provide help info at interactive mode for each meta attribute

crm(live/alp-1)configure# rsc_defaults maintenance=
maintenance (boolean, [false]): If true, the cluster will not schedule any actions involving the resource
    If true, the cluster will not start, stop, promote, or demote the resource on any node, and will pause any recurring monitors (except those specifying role as "Stopped"). If false, a true value for the maintenance-mode cluster option or maintenance node attribute overrides this.

crm(live/alp-1)configure# primitive d Dummy meta  allow-migrate= 
allow-migrate (boolean): Whether the cluster should try to "live migrate" this resource when it needs to be moved
    Whether the cluster should try to "live migrate" this resource when it needs to be moved. The default is true for ocf:pacemaker:remote resources, and false otherwise.

Note: This PR also supports original way for resource meta if pacemaker doesn't have such option

[codecov]

Codecov Report

Attention: Patch coverage is 65.71429% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 53.75%. Comparing base (ea6db17) to head (06a5332).
Report is 2 commits behind head on master.

Files	Patch %	Lines
crmsh/ui_configure.py	16.66%	10 Missing ⚠️
crmsh/ra.py	91.66%	1 Missing ⚠️
crmsh/utils.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1424   +/-   ##
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  Coverage   53.75%   53.75%           
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  Files          80       80           
  Lines       24059    24091   +32     
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+ Hits        12932    12951   +19     
- Misses      11127    11140   +13     

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