Using common method 'bool_from_string' from oslo strutils

Using common method 'bool_from_string' from oslo strutils to replace
utils.string_to_bool.

partially implements blueprint common-client-library-2

Change-Id: I22ee9c5a4b48e85606e033ab87d4adb72b665ee6
Add back --insecure option to CURL debug

This was added in review: https://review.openstack.org/#/c/53500 but
lost in the conversion to using session. Add it back again.

Change-Id: Ia063eb018d3a7da706a02d60df63bfa1be21d147
Related-Bug: #1249891
Fix debug curl commands for included data

Include the submitted data in the curl debug statement.
Initially fixed in: https://review.openstack.org/#/c/53501

Change-Id: I4e3e9e4799a508666fb37fafe864eea25b676836
Closes-Bug: #1249891
Update my mailmap

Using new email address.

Change-Id: I10aba0fc0b175c00508ffdb75c2e292aafac7b09
HTTPretty: Bump to 0.8.0

The 0.8.0 release brings full support for Python 3.

Change-Id: I7237c986efffa0474f7d76bca69a08a26b21adbd
Closes-Bug: 1249165
Remove vim header

We don't need vim modelines in each source file, it can be set in
user's vimrc.

Change-Id: Ic7a61430a0a320ce6b0c4518d9f5d988e35f8aae
Closes-Bug: #1229324
Python: Pass bytes to derive_keys()

This call was missed in d71b5b3.

Change-Id: I0705dbefa5893e0ff5b786202f58fb254939ae76
Merge "Python: Pass bytes to derive_keys()"
Merge "Add back --insecure option to CURL debug"
Merge "Fix debug curl commands for included data"
Merge "Update my mailmap"
Merge "HTTPretty: Bump to 0.8.0"
Merge "Remove vim header"
Merge "Using common method 'bool_from_string' from oslo strutils"