Duplicate edgefs's NetworkSpec funcs to rook
rook: Add NetworkSpec related tests
Support multus's json syntax
Add ApplyMultus using json
Fix uncaught index error on parseMultusSelector
Fix parseMultusSelector short form
Fix invalid JSON literal on network_test.go
rook: Ignore selectors order in ApplyMultus tests
rook: Improve network docs and tests readability
rook: Change IsHost and IsMultus network func signature
Signed-off-by: giovanism <giovanism@outlook.co.id>