vm/bhyve: added customizable bhyve arguments

[brendabrandy]

When using syzkaller on freebsd, i found myself needing to add extra arguments to the bhyve invocation.

Since QEMU has a similar qemu_args option, I created an equivalent bhyve_args option.

[dvyukov]

Seems reasonable. Thanks.
Waiting for CI to pass.

[dvyukov]

CI complains about commit message and code formatting, these need to be fixed before we can merge:

Error: Wrong commit subject format: '[vm/bhyve]: added customizable bhyve arguments'. Please use 'main/affected/package: short change description'. See docs/contributing.md for details. Regex pattern used to check commit subjects is '^(Revert "|(([a-z0-9/_.-]+|Makefile|CONTRIBUTORS|README.md)(, )?)+:\ [^A-Z].+[^.]$)'.
./tools/check-language.sh
1 commits checked for format style (git log -n 1 17efcc2715044770b30cefd58fb18155776faef7)
diff --git a/vm/bhyve/bhyve.go b/vm/bhyve/bhyve.go
index 30c2b76..76a74c6 100644
--- a/vm/bhyve/bhyve.go
+++ b/vm/bhyve/bhyve.go
@@ -28,13 +28,13 @@ func init() {
 }
 
 type Config struct {
-	Bridge      string `json:"bridge"`      // name of network bridge device, optional
-	Count       int    `json:"count"`       // number of VMs to use
-	CPU         int    `json:"cpu"`         // number of VM vCPU
-	HostIP      string `json:"hostip"`      // VM host IP address
-	Mem         string `json:"mem"`         // amount of VM memory
-	Dataset     string `json:"dataset"`     // ZFS dataset containing VM image
-	BhyveArgs   string `json:"bhyve_args"`	// extra arguments to bhyve
+	Bridge    string `json:"bridge"`     // name of network bridge device, optional
+	Count     int    `json:"count"`      // number of VMs to use
+	CPU       int    `json:"cpu"`        // number of VM vCPU
+	HostIP    string `json:"hostip"`     // VM host IP address
+	Mem       string `json:"mem"`        // amount of VM memory
+	Dataset   string `json:"dataset"`    // ZFS dataset containing VM image
+	BhyveArgs string `json:"bhyve_args"` // extra arguments to bhyve
 }
 
 type Pool struct {
vm/bhyve/bhyve.go:1:1: The file is not formatted/regenerated. Run 'make generate' and include it into the commit.
Error: The file is not formatted/regenerated. Run 'make generate' and include it into the commit.
1269 files checked for copyright statement

[brendabrandy]

Fixed my PR . Can we restart the workflow?

[a-nogikh]

@brendabrandy please drop the Merge branch 'google:master' into master - we rebase instead of merging.