dep: update consul-template to v0.26.0 (#11838)

* dep: update consul-template to v0.26.0

* changelog: add a CL entry

changelog/11838.txt

+```release-note:bug
+agent: fix timestamp format in log messages from the templating engine
+```
+
+```release-note:bug
+agent/template: fix command shell quoting issue
+```
\ No newline at end of file

go.mod

@@ -55,7 +55,7 @@ require (
 	github.com/google/go-cmp v0.5.5
 	github.com/google/go-github v17.0.0+incompatible
 	github.com/google/go-metrics-stackdriver v0.2.0
-	github.com/hashicorp/consul-template v0.25.2
+	github.com/hashicorp/consul-template v0.26.0
 	github.com/hashicorp/consul/api v1.4.0
 	github.com/hashicorp/errwrap v1.1.0
 	github.com/hashicorp/go-bindata v3.0.8-0.20180209072458-bf7910af8997+incompatible

go.sum

@@ -558,6 +558,8 @@ github.com/hashicorp/cap v0.1.0 h1:uBDfu9NDvmotza/mJW6vtQId+VYid9ztlTnDCW6YUWU=
 github.com/hashicorp/cap v0.1.0/go.mod h1:VfBvK2ULRyqsuqAnjgZl7HJ7/CGMC7ro4H5eXiZuun8=
 github.com/hashicorp/consul-template v0.25.2 h1:4xTeLZR/pWX2mESkXSvriOy+eI5vp9z3p7DF5wBlch0=
 github.com/hashicorp/consul-template v0.25.2/go.mod h1:5kVbPpbJvxZl3r9aV1Plqur9bszus668jkx6z2umb6o=
+github.com/hashicorp/consul-template v0.26.0 h1:sLjsLZI4oMUNcvcV376F6OhJHWwWRlZ8hjfyPujEMm4=
+github.com/hashicorp/consul-template v0.26.0/go.mod h1:HoNM2jHenwY2bqNHn5yYoMSAtHEFhbUDHYf1ZwTBOmg=
 github.com/hashicorp/consul/api v1.3.0/go.mod h1:MmDNSzIMUjNpY/mQ398R4bk2FnqQLoPndWW5VkKPlCE=
 github.com/hashicorp/consul/api v1.4.0 h1:jfESivXnO5uLdH650JU/6AnjRoHrLhULq0FnC3Kp9EY=
 github.com/hashicorp/consul/api v1.4.0/go.mod h1:xc8u05kyMa3Wjr9eEAsIAo3dg8+LywT5E/Cl7cNS5nU=
@@ -858,6 +860,8 @@ github.com/mattn/go-runewidth v0.0.2/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzp
 github.com/mattn/go-runewidth v0.0.3/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
 github.com/mattn/go-shellwords v1.0.10 h1:Y7Xqm8piKOO3v10Thp7Z36h4FYFjt5xB//6XvOrs2Gw=
 github.com/mattn/go-shellwords v1.0.10/go.mod h1:EZzvwXDESEeg03EKmM+RmDnNOPKG4lLtQsUlTZDWQ8Y=
+github.com/mattn/go-shellwords v1.0.12 h1:M2zGm7EW6UQJvDeQxo4T51eKPurbeFbe8WtebGE2xrk=
+github.com/mattn/go-shellwords v1.0.12/go.mod h1:EZzvwXDESEeg03EKmM+RmDnNOPKG4lLtQsUlTZDWQ8Y=
 github.com/matttproud/golang_protobuf_extensions v1.0.1 h1:4hp9jkHxhMHkqkrB3Ix0jegS5sx/RkqARlsWZ6pIwiU=
 github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
 github.com/mholt/archiver v3.1.1+incompatible h1:1dCVxuqs0dJseYEhi5pl7MYPH9zDa1wBi7mF09cbNkU=