Support bash kernel in notebook-http mode

[kevin-bates]

While looking into #381, it was found that the execution request sent to the kernel to initialize the REQUEST information into the kernel's state, was triggering a command not found exception because bash variable initialization doesn't tolerate space-separated initialization and, as a result, took the following statement as an attempt to execute the command REQUEST:

REQUEST = "{\\"body\\": \\"\\", \\"args\\": {}, \\"path\\": {}, \\"headers\\": {\\"Host\\": \\"127.0.0.1:10100\\", \\"User-Agent\\": \\"curl/7.85.0\\", \\"Accept\\": \\"*/*\\"}}"

This pull request adds an additional format statement unique to bash kernels that removes the spaces around the statement, resulting in an execution request of:

REQUEST="{\\"body\\": \\"\\", \\"args\\": {}, \\"path\\": {}, \\"headers\\": {\\"Host\\": \\"127.0.0.1:10100\\", \\"User-Agent\\": \\"curl/7.85.0\\", \\"Accept\\": \\"*/*\\"}}"

Resolves #381

[codecov]

Codecov Report

Patch coverage: 96.00% and project coverage change: +0.08 🎉

Comparison is base (c72803a) 95.69% compared to head (7e934a4) 95.77%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #382      +/-   ##
==========================================
+ Coverage   95.69%   95.77%   +0.08%     
==========================================
  Files          31       31              
  Lines        2251     2273      +22     
==========================================
+ Hits         2154     2177      +23     
+ Misses         97       96       -1     

Impacted Files	Coverage Δ
kernel_gateway/tests/test_jupyter_websocket.py	99.45% <ø> (ø)
kernel_gateway/gatewayapp.py	84.66% <88.88%> (+0.68%)	⬆️
kernel_gateway/notebook_http/request_utils.py	100.00% <100.00%> (ø)
..._gateway/tests/notebook_http/test_request_utils.py	100.00% <100.00%> (ø)
kernel_gateway/tests/test_gatewayapp.py	100.00% <100.00%> (ø)

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