fix notification email encrypt/decrypt implementation

[fmigneault]

Changes

• Add utility methods for Job to easily retrieve its various URLs.
• Add weaver.wps_email_notify_timeout setting (default 10s) to avoid SMTP server deadlock on failing connection.
• Modify the encrypt_email function to use an alternate strategy allowing decrypt_email on Job completed.
• Remove notification_email from GET /jobs query parameters. Due to the nature of the encryption strategy, this cannot be supported anymore.

Fixes

• Fix Job submitted with a notification_email not reversible from its encrypted value to retrieve the original email on Job completion to send the notification (fixes #568).
• Fix example Mako Template for email notification using an unavailable property ${logs}. Instead, the new utility methods job.[...]_url should be used to retrieve relevant locations.

[codecov[bot]]

Codecov Report

Merging #571 (4b50015) into master (3680c5d) will increase coverage by 0.15%. The diff coverage is 91.66%.

@@            Coverage Diff             @@
##           master     #571      +/-   ##
==========================================
+ Coverage   84.55%   84.71%   +0.15%     
==========================================
  Files          79       79              
  Lines       17793    17828      +35     
  Branches     2709     2708       -1     
==========================================
+ Hits        15045    15103      +58     
+ Misses       2020     1992      -28     
- Partials      728      733       +5     

Files	Coverage Δ
weaver/store/base.py	100.00% <ø> (ø)
weaver/store/mongodb.py	78.31% <100.00%> (-0.07%)	:arrow_down:
weaver/wps_restapi/jobs/jobs.py	89.63% <ø> (-0.11%)	:arrow_down:
weaver/wps_restapi/swagger_definitions.py	99.82% <ø> (-0.01%)	:arrow_down:
weaver/notify.py	80.64% <97.43%> (+43.14%)	:arrow_up:
weaver/datatype.py	79.08% <88.23%> (+0.26%)	:arrow_up:
weaver/processes/execution.py	84.33% <33.33%> (-0.20%)	:arrow_down: