Add support for copying attachments to a remote Bugzilla

Registered by Kamran Riaz Khan

Expected behavior:

$ ./send-attachments-upstream.py --<email address hidden> --pass=xxx https://bugs.launchpad.net/ubuntu/+bug/223435 https://partner-bugzilla.redhat.com/show_bug.cgi?id=593605
Logging in Launchpad [Success <Logged in as Kamran Riaz Khan>]
Logging in Bugzilla [Success <Logged in as <email address hidden>>]
Uploading: Dependencies.txt [Success]
Uploading: Disassembly.txt [Success]
Uploading: ProcMaps.txt [Success]
Uploading: ProcStatus.txt [Success]
Uploading: Registers.txt [Success]
Uploading: Stacktrace.txt [Success]
Uploading: ThreadStacktrace.txt [Success]
Uploading: Stacktrace.txt (retraced) [Success]
Uploading: ThreadStacktrace.txt (retraced) [Success]

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
None
Direction:
Needs approval
Assignee:
Kamran Riaz Khan
Definition:
Approved
Series goal:
None
Implementation:
Implemented
Milestone target:
None
Started by
Kamran Riaz Khan
Completed by
Kamran Riaz Khan

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