SUBMARINE-764. Fix environment spec parse errors

[KUAN-HSUN-LI]

What is this PR for?

• Support pip dependencies in kernel spec
• Change the old dependencies in kernel spec to condaDependencies

What type of PR is it?

[Improvement]

Todos

What is the Jira issue?

https://issues.apache.org/jira/browse/SUBMARINE-764

How should this be tested?

run the following command

curl -X POST -H "Content-Type: application/json" -d '
{
  "name": "my-submarine-env1",
  "dockerImage" : "continuumio/anaconda3",
  "kernelSpec" : {
    "name" : "team_default_python_3.7",
    "channels" : ["defaults"],
    "condaDependencies" : 
      ["_ipyw_jlab_nb_ext_conf=0.1.0=py37_0",
      "alabaster=0.7.12=py37_0",
      "anaconda=2020.02=py37_0",
      "anaconda-client=1.7.2=py37_0",
      "anaconda-navigator=1.9.12=py37_0"],
    "pipDependencies" : 
      ["apache-submarine==0.5.0",
       "pyarrow==0.17.0"]
  }
}
' http://127.0.0.1:32080/api/v1/environment

Screenshots (if appropriate)

Questions:

• Does the licenses files need update? No
• Is there breaking changes for older versions? Yes
• Does this needs documentation? No

[KUAN-HSUN-LI]

@pingsutw Could you please help me review this PR, thanks!

[pingsutw]

@KUAN-HSUN-LI Thanks for your contribution
Some comments in the below.

[KUAN-HSUN-LI]

@pingsutw Thanks! I have added.

[pingsutw]

+1, thanks @KUAN-HSUN-LI
Could you also create a JIRA ticket that updates the environment docs?
https://submarine.apache.org/docs/api/environment