IPEX Grant with chained credentials

[lenkan]

Currently, there is no integration test for issuing a chained credential. I created a script in #144 when I reported WebOfTrust/keria#135 in KERIA.

I have updated the script in #144 to use the new /ipex/grant endpoint introduced in WebOfTrust/keria#137. But I did not get it to work. KERIA crashed after the POST. I used KERIA from commit 97c63d06b9eb781cfccf4f7fe95d957442b728c6 .

Traceback (most recent call last):
  File "/home/lenkan/code/keria/.venv/bin/keria", line 33, in <module>
    sys.exit(load_entry_point('keria', 'console_scripts', 'keria')())
  File "/home/lenkan/code/keria/src/keria/app/cli/keria.py", line 31, in main
    raise ex
  File "/home/lenkan/code/keria/src/keria/app/cli/keria.py", line 25, in main
    doers = args.handler(args)
  File "/home/lenkan/code/keria/src/keria/app/cli/commands/start.py", line 20, in <lambda>
    parser.set_defaults(handler=lambda args: launch(args))
  File "/home/lenkan/code/keria/src/keria/app/cli/commands/start.py", line 74, in launch
    runAgent(name=args.name,
  File "/home/lenkan/code/keria/src/keria/app/cli/commands/start.py", line 107, in runAgent
    directing.runController(doers=doers, expire=expire)
  File "/home/lenkan/code/keria/.venv/lib/python3.10/site-packages/keri/app/directing.py", line 665, in runController
    doist.do(doers=doers)
  File "/home/lenkan/code/keria/.venv/lib/python3.10/site-packages/hio/base/doing.py", line 156, in do
    self.recur()  # increments .tyme runs recur context
  File "/home/lenkan/code/keria/.venv/lib/python3.10/site-packages/hio/base/doing.py", line 275, in recur
    tock = dog.send(self.tyme)  # yielded tock == 0.0 means re-run asap
  File "/home/lenkan/code/keria/.venv/lib/python3.10/site-packages/hio/base/doing.py", line 922, in do
    self.done = self.recur(tyme=tyme)  # equv of doist.recur
  File "/home/lenkan/code/keria/.venv/lib/python3.10/site-packages/hio/base/doing.py", line 1026, in recur
    tock = dog.send(tyme)  # yielded tock == 0.0 means re-run asap
  File "/home/lenkan/code/keria/.venv/lib/python3.10/site-packages/hio/base/doing.py", line 922, in do
    self.done = self.recur(tyme=tyme)  # equv of doist.recur
  File "/home/lenkan/code/keria/.venv/lib/python3.10/site-packages/hio/base/doing.py", line 1026, in recur
    tock = dog.send(tyme)  # yielded tock == 0.0 means re-run asap
  File "/home/lenkan/code/keria/.venv/lib/python3.10/site-packages/hio/base/doing.py", line 922, in do
    self.done = self.recur(tyme=tyme)  # equv of doist.recur
  File "/home/lenkan/code/keria/src/keria/app/agenting.py", line 524, in recur
    rec = msg["rec"]
KeyError: 'rec'

I have not had a chance to look further into it yet, so there might be an issue in the integration test rather than the server code.