pygnssutils Pull Request Template

Description

Various enhancements to gnssntripclient & gnssmqttclient:

gnssntripclient - Add retry, retryinterval and timeout parameters. NTRIP client can now automatically retry failed or inactive network connections.
gnssntripclient & gnssmqttclient - Add support for TCP socket server output --clioutput 3; will send raw RTCM3/SPARTN data to designated socket; data can be consumed by any suitable socket client e.g. gnssdump -S 0.0.0.0:50010
gnssntripclient & gnssmqttclient - Log levels amended, will output full parsed message if verbosity is HIGH, but only parsed identity if verbosity is MEDIUM

Type gnssntripclient -h or gnssmqttclient -h for help.

Other streamlining and refactoring:

CLI wrappers refactored into separate *_cli.py modules.
Various minor pylint advisories.

Fixes #73

Testing

Please test all changes, however trivial, against the supplied pytest suite tests/test_*.py. Please describe any test cases you have amended or added to this suite to maintain >= 99% code coverage.

[x] Tested for connection failure and inactivity timeout

Checklist:

[x] I agree to abide by the code of conduct (see CODE_OF_CONDUCT.md).
[x] My code follows the style guidelines of this project (see CONTRIBUTING.md).
[x] I have performed a self-review of my own code.
[x] (if appropriate) I have cited my u-blox documentation source(s).
[x] I have commented my code, particularly in hard-to-understand areas.
[x] I have made corresponding changes to the documentation.
[x] (if appropriate) I have added test cases to the tests/test_*.py unittest suite to maintain >= 99% code coverage.
[x] I have tested my code against the full tests/test_*.py unittest suite.
[x] My changes generate no new warnings.
[x] Any dependent changes have been merged and published in downstream modules.
[x] I have signed my commits.
[x] I understand and acknowledge that the code will be published under a BSD 3-Clause license.

semuconsulting / pygnssutils

add network retry to gnssntripclient #74