Fix issue with symlink path detection

Fixes #7627
Fixes #7664
Update developing_modules.rst
Merge pull request #7675 from eludom/patch-1

Update developing_modules.rst
Merge pull request #7676 from jimi-c/fix_symlinks

Fix issue with symlink path detection
Show friendlier error message if nova.ini is not found.

Signed-off-by: Hector Acosta <hector.acosta@gmail.com>
Merge pull request #7678 from hacosta/devel

Show friendlier error message if nova.ini is not found.
Fix typo in nova_keypair import of exceptions from novaclient

Fixes #7640
Added an integration test for the ec2_asg module
Fix default availability zone list
Fixed asg instance count polling
Catch failed connection due to a bad region in ec2_scaling_policy

Fixes #7506
Catch failed connection due to a bad region in ec2_scaling_policy

Fixes #7505