Fix utils unit test
Update Changelog for config unittests
Refs: #4058
Replace writelines with write+flush
Implement member versions of utils print methods
Refs: #4292
Fix history read unicode issue
Update commands to use pager when --more
Refs: #4279
Modify printing methods to use more stream types
Refs: #4288, #4279
Also, replace page_hold with pydoc.pager
Fix split input bug
Refs: #4232
Impement basic/custom filters for server list
Refs: #4220
New filters: name[-like/-suffix/-prefix], flavor_id, image_id, metadata[-like]
Try a unified filtering method in image ? list
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