Several updates #3

* Move SessionResource and CertificateAuthorityResource to api/session.py
* Log browser user agent for logins
* Remove static sink from backend, nginx always serves static now
* Don't emit 'attribute-update' event if no attributes were changed
* Better CN extraction from DN during lease update
* Log user who deleted request
* Remove long polling CRL fetch API call and relevant test
* Merge auth decorators ldap_authenticate, kerberos_authenticate, pam_authenticate
* Add 'kerberos subnets' to distinguish authentication method
* Add 'admin subnets' to filter traffic to administrative API calls
* Highlight recent log events
* Links to switch between 2, 3 and 4 column layouts in the dashboard
* Restored certidude client snippets in request dialog
* Various bugfixes, improved log messages

.travis.yml

@@ -7,7 +7,8 @@ after_success:
   - codecov
 script:
   - echo registry=http://registry.npmjs.org/ | sudo tee /root/.npmrc
-  - sudo apt install software-properties-common python3-setuptools python3-mysql.connector python3-pyxattr
+  - sudo apt install software-properties-common python3-setuptools build-essential python3-dev libsasl2-dev libkrb5-dev
+  - sudo apt remove python3-mimeparse
   - sudo mkdir -p /etc/systemd/system # Until Travis is stuck with 14.04
   - sudo easy_install3 pip
   - sudo -H pip3 install -r requirements.txt