Migrate to bcrypt (#8446)

* start migrating to bcrypt

* added method to convert the password to bcrypt when logging in, added method to compare password without knowing the hashing algorhytm, remove default

* travis: try to upgrade to container based infrastructure

* travis: add deps to build bcrypt.js

* travis: add deps to build bcrypt.js

* travis: add deps to build bcrypt.js

* travis: add deps to build bcrypt.js

* use bcryptjs until bcrypt can be installed on travis, see https://github.com/kelektiv/node.bcrypt.js/issues/476

* correct sha1 unit tests

* try different mongodb repo

* try without mognodb services

* try again with bcrypt

* disable request logging in travis

* migrate missing routes

* simplify code

* remove bcryptjs

* fix typo

* fix typo

* fix typo in comment

* add unit tests for new passwords utility emthods

* travis: back to old infrastructure, containers often have timeouts

* add integration test for passwordHashMethod

* update shrinkwrap

* clarify code and add comments

* add integration tests

* fix linting

* fix integration tests

test/helpers/mongo.js

@@ -55,8 +55,8 @@ export async function resetHabiticaDB () {
               username: 'username',
               lowerCaseUsername: 'username',
               email: 'username@email.com',
-              salt: 'salt',
               hashed_password: 'hashed_password', // eslint-disable-line camelcase
+              passwordHashMethod: 'bcrypt',
             },
           },
         }, (insertErr) => {