Unify installer context to be 'installer'

'install' was being used in some places.

The context can be used to limit what configuration is
used for a given request so having consistency is
valuable.

This affected the force_schema_updates value in LDAPClient
which looks for api.env.context in ('installer', 'updates')

Related: https://pagure.io/freeipa/issue/8798

Signed-off-by: Rob Crittenden <rcritten@redhat.com>
Reviewed-By: Rafael Guterres Jeffman <rjeffman@redhat.com>

install/tools/ipa-adtrust-install.in

@@ -161,7 +161,7 @@ def main():
     api.bootstrap(
         in_server=True,
         debug=options.debug,
-        context='install',
+        context='installer',
         confdir=paths.ETC_IPA
     )
     api.finalize()

install/tools/ipa-ca-install.in

@@ -294,7 +294,7 @@ def main():
     # override ra_plugin setting read from default.conf so that we have
     # functional dogtag backend plugins during CA install
     api.bootstrap(
-        context='install', confdir=paths.ETC_IPA,
+        context='installer', confdir=paths.ETC_IPA,
         in_server=True, ra_plugin='dogtag'
     )
     api.finalize()

install/tools/ipa-dns-install.in

@@ -131,7 +131,7 @@ def main():
 
     # Initialize the ipalib api
     api.bootstrap(
-        context='install', confdir=paths.ETC_IPA,
+        context='installer', confdir=paths.ETC_IPA,
         in_server=True, debug=options.debug,
     )
     api.finalize()