Fixes #4032 - Use object.id for comparisons

(cherry picked from commit 409ce13e71b5a23178e109b0fb240fc2e2c6ff94)

fixes #4152 - fix syntax error in _form.html.erb for hosts and hostgroups

(cherry picked from commit 378c65e5af8ff131ae1701c78934d6bbd0a055e9)

fixes #3955 - added param_true? and snippet_if_exist template methods

(cherry picked from commit 3701a8d1c6d698ea8c57321eed2f87c74bd57728)

fixes #3828 - set language locale for API messages and error responses

(cherry picked from commit 5a864bedb5d9bbbb68788169aa0f0396a312ac16)

fixes #3826: no more sql errors when trying to search for environments (also domains, operatingsystems, and models)

(cherry picked from commit 145db8634df9fbc3ffb51b80093809c5aecd0f6e)

fixes #3925 - create apipie param_groups for API v2 to DRY documentation

(cherry picked from commit 2be84f3d773e74b5cc37841284ec216996fd0b51)

fixes #3920 - prevent 500 ScopedSearch errors on the API, raise UI errors correctly

(cherry picked from commit f9bc5a8e5934aac9bd8d5488f84717d33e359501)

fixes #359 - hostname spoofing for unattended installation templates

(cherry picked from commit 5b70f0e0232bff3e580923f485bc0bd1816d9279)

fixes #3760 - API v2 define metadata @total for each controller

(cherry picked from commit 6f9438866488180e196ff18e1372cf0773afe7b9)

Conflicts:
foreman.spec

fixes #4023 - API v2 - compute resources partials should should attribute alias names and not database column names

(cherry picked from commit 8a0ffcfaa900079d628253ee7f9de2feec182914)