[Bug 931] Trex config file (yaml) will break dts with valid yaml

[Bug 931] Trex config file (yaml) will break dts with valid yaml

[bugzilla]

https://bugs.dpdk.org/show_bug.cgi?id=931

            Bug ID: 931
           Summary: Trex config file (yaml) will break dts with valid yaml
           Product: DTS
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: framework
          Assignee: dts@dpdk.org
          Reporter: ohilyard@iol.unh.edu
  Target Milestone: ---

framework/crb.py:503 (check_trex_process_existed)
```
if 'config_file' in conf_info:
    config_file = conf_info['config_file']
else:
    config_file = '/etc/trex_cfg.yaml'
fd = open(config_file, 'r')
output = fd.read()
fd.close()
prefix = re.search("prefix\s*:\s*(\S*)", output)
if prefix is not None:
    self.trex_prefix = prefix.group(1)
```

This will break if quotes are used even though 'prefix: "trex1"' and 'prefix:
trex1' are semantically equivalent. An actual yaml parser should be used to
extract this information to avoid this fragility.

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