Implement Security Token to allow writes/deletes

[am283721]

References:

https://docs.ca.com/ca-agile-central/saas/apps/2.1/doc/source/Global3.html#Rally-sdk-env-Global-method-_fetchSecurityTokenBeforeRequest

https://github.com/RallyTools/rally-node/blob/master/lib/request.js#L25-L31

[am283721]

Sample usage in exterior app:

if (!Rally.env.IoProvider.getSecurityToken()) {
    let resp = await Rally.environment.getIoProvider().httpGet({
        type: 'security/authorize',
    });

    if (!resp) { throw new Error(); }

    this._token = resp.SecurityToken;
    Rally.env.IoProvider.setSecurityToken(resp.SecurityToken);
} else if (!this._token) {
    this._token = Rally.env.IoProvider.getSecurityToken();
}

project.c_PermissionsRemovedDate = new Date().toISOString();

try {
    await this.client.save(project, {
        key: this._token
    });
} catch (e) {}

To remove Rally SDK dependency, fetch token similar to this:

auth() {
    return this.doRequest('get', {
      url: '/security/authorize'
    }).then((result) => {
      this._token = result.SecurityToken;
    });
  }